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Gepubliceerd in:

Open Access 20-01-2025

Irritability as a Transdiagnostic Construct Across Childhood and Adolescence: A Systematic Review and Meta-analysis

Auteurs: Miriam Chin, Davina A. Robson, Hannah Woodbridge, David J. Hawes

Gepubliceerd in: Clinical Child and Family Psychology Review | Uitgave 1/2025

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Abstract

This meta-analytic review examined irritability across childhood and adolescence as it relates to symptoms of common mental health disorders in these periods. Of key interest was whether the relationship between irritability and symptom severity varies according to symptom domain. This was tested at the level of broad symptom dimensions (internalizing versus externalizing problems) as well as discrete diagnostic domains (e.g., anxiety, depression, oppositional defiant disorder, conduct disorder, attention deficit hyperactivity disorder; autism spectrum disorder). Following PRISMA guidelines, a systematic search of five databases was conducted to identify studies reporting on associations between irritability and mental health symptoms in samples of children aged 2–18 years. Meta-analytic tests based on random effects models examined concurrent and longitudinal associations between irritability and symptom severity. Meta-regression tested potential moderators including symptom domain, child age, sex, informant type, and study quality. 119 studies met inclusion criteria with a total of 122,456 participants. A significant and positive association was found between irritability and severity of concurrent overall psychopathology in the order of a moderate effect size, while small to moderate effect sizes characterized the association between irritability and later mental health outcomes in prospective data. Further variation in this association was seen across specific diagnostic domains and methodological moderators. Findings support the conceptualization of irritability as a transdiagnostic construct reflecting emotion dysregulation across diverse forms of psychopathology in childhood and adolescence. Further research into the risk mechanisms underlying irritability is needed, in addition to translational approaches to early intervention.
Opmerkingen

Supplementary Information

The online version contains material available at https://​doi.​org/​10.​1007/​s10567-024-00512-4.

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Introduction

Irritability has long featured in the clinical descriptions of many psychological disorders, however, it is only in recent years that the construct has been subject to extensive scientific investigation in its own right. Recent interest in the construct has arisen in part from assertions that it represents a key transdiagnostic construct implicated in diverse forms of psychopathology, with developmental origins early in life (Beauchaine & Tackett, 2020; Klein et al., 2021). Accordingly, disorders of childhood and adolescence have been a key focus of emerging research into irritability, which has spanned topics from measurement and diagnostic models, through to risk mechanisms and intervention targets (e.g., Leibenluft et al., 2024; Zachary & Jones, 2019). Moreover, there is growing recognition that irritability is one of the most common reasons for referral to mental health services in childhood (Evans et al., 2023). Irritability nonetheless remains a somewhat elusive construct, and researchers have just begun to synthesize the expansive evidence base that now exists, through systematic approaches such as meta-analysis (Brotman et al., 2017; Finlay-Jones et al., 2024; Vidal-Ribas et al., 2016).
Current definitions of irritability refer primarily to low frustration tolerance (Toohey & DiGiuseppe, 2017) or a low threshold for experiencing anger in response to slight provocation, incongruent with developmental age (Brotman et al., 2017). In diagnostic models, irritability has often been operationalized as a categorical symptom and conceptualized largely as a state-dependent mood lasting days to weeks, occurring in the absence of an obvious trigger. In literature on individual differences concerning temperament and personality, irritability has been conceptualized as the extreme expression of a dimensionally distributed trait that is heritable and relatively stable from early childhood to adulthood (Beauchaine & Tackett, 2020; Leibenluft & Stoddard, 2013).
Researchers have employed a wide range of measurement strategies to capture various aspects of irritability in child and adolescent samples, such as indexing mood versus behavior or persistent irritability versus temper outbursts. Common approaches have included the selection of specific symptom items from diagnostic interviews (e.g., Kiddie Schedule for Affective Disorders and Schizophrenia; Kaufman et al., 2000), subscales from temperament questionnaires (e.g., Child Behavior Questionnaire; Rothbart et al., 2001), along with instruments specifically designed to index irritability (e.g., Affective Reactivity Index; Stringaris et al., 2012). Research suggests that the prevalence and severity of irritability may significantly differ depending on whether the measure is self-report, parent-report, or teacher report (De Los Reyes et al., 2015; Evans et al., 2023). Moreover, from a developmental perspective, the age at which irritability is indexed can have important implications for conceptualization and measurement. There is support for the measurement of irritability as a distinct temperament dimension from infancy (Rothbart, 2011), however, studies of infants and toddlers have often operationalized irritability using non-specific indices (e.g., excessive crying) or broader dimensions such as negative emotionality that encompass other forms of distress (Finlay-Jones et al., 2024). As a specific mental health construct, irritability can present at clinically significant levels in children as young as 2 years (Camacho et al., 2019). Measures of irritability have often been used to operationalize the clinical expression of emotion dysregulation, which itself encompasses processes including emotional expressions and experiences that are inappropriate to context or excessive based on social norms; shifts in emotion that are rapid or poorly controlled; and the atypical allocation of attention to emotional stimuli (Evans et al., 2021a; Vogel et al., 2019; Shaw et al., 2014).
Evidence regarding irritability has important implications for the diagnosis and classification of child and adolescent psychopathology. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) (American Psychiatric Association; APA, 2013) and The International Classification of Disease (ICD-11) (World Health Organization, 2022) both include irritability as a symptom in the criteria for disorders including oppositional defiant disorder (ODD), major depressive disorder in children and adolescents, and generalized anxiety disorder. ODD, for example, includes a distinct symptom dimension reflecting chronic irritability, which is thought to account in part for findings that ODD in childhood is a common precursor to many other forms of psychopathology across adolescence and later life (e.g., depression, suicidality, substance use, psychosis) (Burke et al., 2021; Hawes et al., 2023). Recent revisions to the major diagnostic systems also reflect ongoing debate regarding the classification of chronic irritability (Evans et al., 2021a; Fristad, 2021; Runions et al., 2016). For example, DSM-5 included a new childhood mood disorder, Disruptive Mood Dysregulation Disorder (DMDD), whereas ICD-11 introduced chronic irritability as a specifier within ODD (See also: Copeland et al., 2013; Lochman et al., 2015).
Interest in irritability as a transdiagnostic construct has grown significantly in recent years, driving considerable research into associations between irritability and various symptom domains. In addition to testing these associations through methods such as factor analysis and network analysis (e.g., Burke et al., 2014; Tseng et al., 2023), meta-analysis has been used in two studies to date. Vidal-Ribas et al. (2016) analyzed data from 12 longitudinal studies of chronic non-episodic irritability as a predictor of future mental health disorders. Irritability was reported to be significantly associated with depression and anxiety but not conduct problems such as ODD and conduct disorder (CD), and research priorities were identified, including the need for studies using high-quality measures of irritability. Research in the area has since grown rapidly, and a number of such measures have been widely adopted, including the Affective Reactivity Index, which is recommended in DSM-5 as a cross cutting symptom measure for irritability in 6–17-year-olds (APA, 2013).
A more recent meta-analysis of 98 longitudinal studies focused specifically on indices of irritability prior to 5 years of age, as predictors of later disorders across childhood and adolescence. Results indicated a small but significant association between infant (0–12 months) and preschool/toddler (13–60 months) irritability and later internalizing and externalizing disorders (Finlay-Jones et al., 2024). The meta-analytic findings of Finlay-Jones et al. (2024) support early irritability during ages 0–5 years as a transdiagnostic neurodevelopmental vulnerability to later psychopathology. At the same time, there exists an extensive and largely separate body of research in which irritability and broader symptoms of psychopathology have been indexed across childhood and adolescence. It is this evidence base that is the focus of our review.

Aims of the Current Review

Our major aim of the current review was to examine associations between irritability and psychopathology across childhood and adolescence (ages 2–18 years). Data on irritability across childhood and adolescence have important implications for understanding irritability as a feature of symptom clusters that covary together during these periods. By conducting the first meta-analytic test of these associations we aim to further inform diagnostic and transdiagnostic models of child and adolescent mental health. Given that Finlay-Jones et al. (2024) focused specifically on irritability in infancy and early childhood, the authors had good justification for including studies in which irritability was operationalized using indices such as fussy temperament, negative emotionality, and excessive crying. Conversely, many studies of irritability as a distinct construct could not be included by Finlay-Jones et al. (2024), because some of the most established and widely used measures of irritability, such as the Affective Reactivity Index, are designed for older children. These studies form the bulk of the evidence base examined in our review, which was limited to data from high quality measures of the specific construct of irritability.
A further aim was to examine how the relationship between irritability and mental health varies as a function of symptom domain. In addition to testing the relationship between irritability and overall symptoms of psychopathology, it was tested also according to broad symptom dimensions (internalizing versus externalizing problems), and a number of more discrete diagnostic domains (anxiety; depression; obsessive compulsive disorder; ODD; conduct disorder; attention deficit hyperactivity disorder [ADHD]; substance use disorder; suicidality/self-harm; tic disorders and autism spectrum disorder [ASD]). These associations were examined both concurrently and prospectively, based on follow-up testing across distinct developmental periods. Finally, in order to help resolve mixed findings from previous research, a number of moderators were tested, consisting of child age, sex, informant type, and study quality.

Method

Search Strategy

This meta-analysis was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA; Page et al., 2021; see Supplementary Table S1), and registered with Prospero (CRD42023404623). A search of five electronic databases was conducted in June 2024. The databases included were PubMed/MEDLINE, Web of Science, PsycINFO, PsycARTICLES, and Scopus. The search terms used were irritability [OR temperament OR negative affectivity] AND child [OR preschool OR early years OR adolescence] AND psychological [OR mental health OR psychopathology OR psychological disorder OR depression OR anxiety OR oppositional defiant disorder OR conduct disorder OR ADHD OR suicide OR autism OR internalizing OR externalizing OR substance OR abuse OR obsessive compulsive disorder OR eating disorder OR social functioning OR emotional functioning]. No date limits were set in the search or restrictions regarding language or the type of publication. A manual search was conducted on the reference list of studies that met inclusion criteria to identify relevant studies that were not included in the databases. In cases where studies did not report sufficient information to convert a score into a zero-order correlation, additional data were requested by email. A total of 58 authors were contacted for this purpose, with data provided by 20 (a response rate of 34%).

Eligibility Criteria

Studies that reported on measures of irritability in children and adolescents between the ages of 2 and 18 years, in relation to mental health outcomes, were eligible for inclusion. Measures of irritability were assessed to determine that they operationalized irritability as low frustration tolerance (Toohey & DiGiuseppe, 2017). Based on this approach, some temperament subscales reflecting this definition of irritability were included. Self-report, parent-report and teacher-report measures of irritability were included, as were observational measures. No restrictions were placed on sample type (e.g., clinical, community-based). Review papers, conference abstracts, books, and case studies, were excluded, as were studies not available in English.

Study Selection

Two researchers independently screened the titles and abstracts of retrieved studies against the inclusion criteria. Full text manuscripts were then independently assessed by two reviewers and any discrepancies were resolved through discussion. Inter-rater reliability (Cohen’s kappa = 0.84) was calculated for the first 100 studies screened, indicating good agreement. Figure 1 summarizes the screening procedure.

Data Extraction

Data extraction was performed by two researchers independently and then cross checked to resolve conflicts via discussion with the research team. The information extracted included study design, total sample size, country where the study was conducted, sex of participants (% male), mean age and standard deviation (or midpoint of age range), measure of irritability, informant type, and mental health outcomes. The effect size metric extracted was the zero-order correlation coefficient (r). When this was not reported, other statistics (e.g., odds ratios, means and standard deviations) were converted to correlation coefficient (r) prior to analysis. This conversion was performed using the formulas provided in the Comprehensive Meta-Analysis 3.0 statistical software program (Borenstein et al., 2014).
Data were extracted for 24 mental health outcomes that had been correlated with irritability in childhood and adolescences. These outcomes were grouped into three broad categories: internalizing, externalizing and neurodevelopmental. Internalizing outcomes included: anxiety disorders (subcomponents: generalized anxiety, social anxiety, separation anxiety, obsessive–compulsive disorder, phobias), depressive disorders, affect dysregulation, suicidality and non-suicidal self-harm. Externalizing outcomes included: disruptive behavior disorders (subcomponents: oppositional defiant disorder, conduct disorder), attention-deficit/hyperactivity disorder, peer problems, antisocial behavior, substance use disorder, and disruptive behavior symptoms (subcomponents: argumentative/defiant, hurtfulness/vindictiveness, aggression, delinquency/rule breaking, callous-unemotional traits/limited prosocial emotions). Neurodevelopmental outcomes included: ASD and tic disorders.

Quality Assessment

The methodological quality of included studies was rated independently by two researchers using the AXIS tool (Downes et al., 2016). This 20-item scale indexes the quality of non-experimental studies across a range of domains including sample size justification, sample representativeness, use of validated measures, overview of analytic methods, information regarding non-response bias, and reporting of conflicts of interest and funding. Studies were assigned a score ranging from 0 to 20, with higher scores reflecting higher quality. Conflicts between the two independent raters were resolved in consultation with members of the research team. Details of the quality ratings are available in supplementary Table S2.

Meta-Analytic Strategy

Meta-analytic tests were conducted based on a random effects model. The inverse-variance weighted random effects model gives more weight to the mean of the effect sizes calculated from the more precise studies, based on the inverse of its variance (Borenstein et al., 2011). This assumes that the true effect from each study varies due to more than expected sample population differences and is best used in meta-analyses with heterogeneous studies.
Publication bias was assessed using the asymmetry depicted in a funnel plot graphic. The funnel plot maps the sample size against the effect size, and publication bias can be seen in asymmetry around the true effect size (Egger et al., 1997). Additionally, Egger’s regression asymmetry test was used to detect potential publication bias. This method uses a linear regression to assess asymmetry in the funnel plot (Egger et al., 1997). A significant value for Egger's regression asymmetry test (two tailed) indicates meaningful publication bias. Publication bias can be due to a number of reasons, for example, reporting biases and editorial decisions favoring larger statistically significant studies (Egger et al., 1997; Rothstein, 2008).
Heterogeneity, whereby studies differ from each other beyond expected random error, was measured using the I2 statistic. If studies are high in heterogeneity, it is reflected in a score of 75 or more; moderate heterogeneity in a score of around 50; low heterogeneity 25 (Higgins & Thompson, 2002). Thus, I2 above 50 and a significant Q statistic (hypothesis test of expected variation between studies) indicates the need to explain this effect by testing moderators (Gonzalez-Mulé & Aguinis, 2018). Moderation analysis was conducted using random-effects meta-regression, when k was greater than 10 and heterogeneity was evident; Borenstein et al., 2011).
Six models were planned, one incorporating concurrent data, and five longitudinal models, each based on separate datasets. The models were based on the developmental time interval between assessment of irritability and outcome measures. Model 2 included studies in which irritability was measured in preschool age (2–5 years) and outcomes in middle childhood (5–13 years); model 3 included middle childhood to later childhood/adolescence (8–18 years); model 4 included middle childhood to adulthood (18 +); model 5 included early adolescence (13–18 years) to late adolescence; model six included adolescence to adulthood. Theorized moderators included child age (mean age), sex (percentage of boys in the sample), informant type, (parent, teacher, or self-report) and study quality (AXIS tool score).

Results

Characteristics of Included Studies

Overall, data from 119 studies were analyzed, with 541 effect sizes. There were 77 studies reporting concurrent associations between irritability and mental health symptoms, with 417 effect sizes (n = 66,326). The grand mean age for concurrent associations was 10.6 (± 3.0) years. There were 42 studies reporting longitudinal associations, with 124 effect sizes (n = 56,130). Longitudinal model 2 (preschool to childhood; n = 13,964), included 15 studies representing 65 effect sizes. The grand mean age was 3.9 (± 1.2) years at baseline and 9.2 (± 3.1) years at follow-up. Longitudinal model 3 (childhood to later childhood/adolescence; n = 36,201) included 20 studies representing 39 effect sizes. The grand mean age was 8.1 (± 2.6) years at baseline and 12.4 (± 2.7) years at follow-up. Longitudinal model 4 (childhood to adulthood) included only one study, and therefore could not be conducted (the data from this study were included in model 6). Longitudinal model 5 (adolescence to adolescence; n = 3851) included 4 studies representing 11 effect sizes. The grand mean age was 14.5 (± 0.5) years at baseline and 16.5 (± 1.3) years at follow-up. Longitudinal model 6 (adolescence to adulthood; n = 1840) included 4 studies representing 9 effect sizes. The grand mean age was 14.4 (± 2.8) years at baseline and 22.1 (± 4.0) years at follow-up.
There was a total of 122,456 participants, including 57,593 females (47.0%) and 64,872 males (53.0%), with 4674 sex unknown (3.8%). The samples were from North and South America (n = 74), Europe (n = 28), Australia (n = 7), Asia (n = 7), and multicontinental (n = 3). There were 36 measures of irritability in the form of parent, self, and teacher reports. The mean score for study quality was 16.8 (± 1.5; range = 12–20), suggesting high reporting standards (Table S2). Characteristics of the included studies are displayed in Table 1.
Table 1
Characteristics of included studies
Study
N
Study design
Country
Child sex (% boys)
Age range or M (SD)
Measure of irritability
Mental health variables
Study quality
Model
Baseline
Time 2
Time3
Aebi et al. (2016)
158
Cross-sectional
Switzerland
Boys
16.89 (1.13)
Self: MINI-KID
Affective disorders
Anxiety disorders
Conduct disorder
ADHD
Suicidality
18
1
Aebi et al. (2013)
1031
Cross-sectional
Switzerland
Both (50%)
13.85 (1.63)
29.6 (1.63)
Self: CBCL-YSR
Parent: CBCL
Anxious/depressed
Attention problems
Delinquent behavior
Depression
Any crime
18
1
Ali et al. (2022)
T1:409
T2: 394
T3: 365
Longitudinal
England
Both (49%)
3.43 (0.30)
5.93
8.59
Observation: LAB-TAB Irritability
Internalizing
Externalizing
Depression
ODD
ADHD
Conduct disorder
16
2
Althoff et al. (2014)
S1: 2029
S2: 2076
S3: 399
Total: 4504
Cross-sectional
America
Dutch
S1: Both (53%)
S2: Both (49%)
S3: Both (53%)
S1: 6–18
S2: 4–16
S3: 10.88 (3.06)
Parent: CBCL
ODD
Conduct disorder
Anxiety
ADHD
15
1
Ambrosini et al. (2013)
500
Cross-sectional
America
Both (73%)
6–18
Self: K-SADS-P
Major depressive disorder
ODD
MDDD
ADHD (combined)
ADHD (inattentive)
15
1
Arana et al. (2021)
S1: 220
S2: 252
Total: 472
Cross-sectional
Netherlands
S1: Both (55%)
S2: Both (50%)
S1: 11.54 (0.49)
S2: 10.85 (0.57)
Parent: HiPIC – Neg. affectivity subscale
Internalizing
Externalizing
Attention problems
Anxiety
17
1
Barclay et al. (2022)
T1: 231
T3: 192
Longitudinal
America
Both (68%)
7.4 (1.1)
9.72 (1.32)
12.09 (1.36)
Teacher: DBD
Parent: DBD
Internalizing
Externalizing
16
3
Barker & Salekin (2012)
5923
Longitudinal
America
Both (51%)
8
10
Parent: DAWBA
Internalizing
CU traits
Conduct problems
Emotional difficulties
Callous attitude
Peer victimization
15
3
Baweja et al. (2021)
226
Cross-sectional
America
Both (73%)
7.6 (1.96)
Parent:
DBDRS
Inattention
Hyperactive-Impulsivity
Inattentive-overactive-impulsivity
Oppositional-defiant
Emotional lability
17
1
Bell et al. (2023)
491
Cross-sectional
Australia
Boys
12–17
  
Self: BiTe
Conduct Problems
18
1
Benarous et al. (2020a)
30
Cross-sectional
Canada
Both (87%)
6–16
Parent:
K-SADS-PL
Externalizing
Internalizing
Depression
15
1
Benarous et al. (2020b)
163
Cross-sectional
Canada
Both (61%)
7–17
Parent:
K-SADS-PL
Anxiety disorders
Substance use disorder
17
1
Bielas et al. (2016)
130
Cross-sectional
Switzerland
Boys
13–18
Self: CIS
Adverse child experience
ADHD
DBD
SUD
Suicidality
Depressive disorders
Anxiety disorders
PTSD
16
1
Bolhuis et al. (2017)
T1: 6209
T2: 4724
Longitudinal
Netherlands
Both (50%)
6
10
Parent: CBCL
Physical aggression
Oppositional behavior
Disobedient behavior
Rule-breaking behavior
Callous traits
17
3
Brandes et al. (2019)
695
Cross-sectional
America
Both (48%)
7–13
Parent: CBCL
Internalizing symptoms
Externalizing symptoms
16
1
Burke (2012)
T1:177
T2: 162
Longitudinal
America
Boys
7–12
17
Parent: DISC
Parent: CSI-IV
Parent: DAWBA
Depression
Anxiety
Conduct disorder
ADHD symptoms
15
3
Burke et al., (2014)
S1: 1517
S2: 2451
S3: 7420
Total: 11,388
Cross-sectional
Cross-sectional
Cross-sectional
America
America
UK
Boys
Girls
Both (50%)
7
5–8
10–11
Parent: DISC
Parent: CSI-IV
Parent: DAWBA
Oppositional behavior
15
1
Busch et al. (2023)
194
Cross-sectional
Germany
Both (60%)
12.52 (2.69)
Self: BiTe
Anxiety
Depression
17
1
Caprara et al. (2017)
109
Cross-sectional
Italy
Both (74%)
11–18
Parent: CIS
Aggression
Emotional instability
Hostile rumination
Moral disengagement
Agreeableness
17
1
Cardinale et al. (2021)
489
Cross-sectional
America
Both (55%)
12.03 (2.41)
Parent: ARI
ADHD Inattentive
ADHD (Hyp/Imp)
17
1
Cardinale et al. (2019)
331
Cross-sectional
America
Both (46%)
13.57 (2.69)
Parent: ARI
Self: ARI
ADHD
Anxiety
DMDD
17
1
Carter-Leno et al. (2021)
52
Cross-sectional
England
Both (60%)
13–17
Parent: ARI
Autism
17
1
Chad-Friedman et al. (2023)
605
Longitudinal
America
Both (54%)
3.52
9.23
15.25
(.40)
Parent: CBCL
Depression
Anxiety
Defiance
ADHD
17
2
Chad-Friedman et al. (2022)
605
Longitudinal
America
Both (48%)
4.17
6.07
Parent:
Daily diary of mood & affect
Depressive symptoms
Anxiety symptoms
ADHD symptoms
ODD symptoms
Global impairment
20
2
Chen et al. (2021)
131
Cross-sectional
America
Both (40%)
13 (2.79)
Self: ARI
Anxiety symptoms
Bullying perpetration
Peer victimization
17
1
Copeland et al. (2015)
1420
Cross-sectional
America
Both (50%)
9–16
Parent & Self: CAPA
Depression
Anxiety
Any impairment
15
1
Courbet et al. (2021)
170
Cross-sectional
France
Both (76%)
6–11
Parent: ARI
ADHD
19
1
Craig et al. (2021)
179
Longitudinal
Canada
Both (54%)
15.34 (1.53)
18
Self: OCHS
Attachment anxiety
Attachment avoidance
ODD symptoms
Affect dysregulation
19
6
DeGroot et al. (2024)
2548
Cross-sectional
America
Both (69%)
12.21 (3.3)
Parent: CBCL
Teacher: CASI
Depressive disorder
Anxiety disorder
ADHD (combined)
ADHD (inattentive)
ODD/CD
Suicidality
17
1
Déry et al. (2017)
276
Longitudinal
Canada
Both (60%)
8.5 (0.9)
9–12
Parent: DISC
Depression
Anxiety
ADHD
ODD (vindictive)
ODD (defiant)
18
3
Doerfler et al. (2020)
310
Cross-sectional
America
Both (35%)
10.65 (3.4)
Parent: K-SADS-P
Depression
Anxious/depressed
Internalizing symptoms
Aggressive behavior
Externalizing symptoms
Global impairment
Total aggression
17
1
Dougherty et al. (2015)
446
Longitudinal
America
Both (55%)
3.51 (.26)
9.25 (.42)
Parent: PAPA
Depressive disorder
Anxiety Disorder
ADHD
DBD
18
2
Dougherty et al. (2016)
473
Longitudinal
America
Both (54%)
6.10 (0.43)
9.21 (0.38)
Parent: PAPA
Depressive disorder
Anxiety Disorder
ADHD
DBD
18
3
Dougherty et al. (2013)
462
Longitudinal
America
Both (54%)
3.6 (0.3)
6.1 (0.4)
Parent: PAPA
Global impairment
Depressive disorder
Anxiety disorder
ADHD
ODD
18
2
Drabick & Gadow (2012)
S1: 546
S2: 614
Total: 1160
Cross-sectional
America
S1: Both (73%)
S2: Both (67%)
S1:6–11
S2: 12–18
Parent: CASI-4R, ASI-4R
Teacher: CASI-4R, ASI-4R
ODD
ADHD (Inattentive)
ADHD (Hyp/Imp): Conduct disorder
GAD
Social anxiety disorder
Major depressive disorder Manic symptoms
17
1
Dugre & Potvin (2020)
4898
Cross-sectional
Canada
Both (52%)
5
Parent: CBCL
Anxiety
Hyperactivity
Physical aggression
17
1
Elvin et al. (2021)
93
Cross-sectional
Australia
Both (56%)
9.96 (0.36)
Self: ARI
Self-regulation positive
Self-regulation negative
Behavioural control
Prosocial behavior
Peer problems
Anxiety
Depression
Conduct Problems
17
1
Elvin et al., (2023)
84
Cross-sectional
Australia
Both (45%)
9.31 (2.44)
Parent: CBCL
Anxiety
16
1
Evans et al., (2021a, 2021b)
237
Cross-sectional
America
Both (64%)
9.14 (3.51)
Parent/youth
(6–18): ARI
Parent (3–5): ARI
Anxiety
Depression
Inattention
Hyperactivity
Suicidality
Aggression
16
1
Evans et al. (2020a)
238
Cross-sectional
America
Both (52%)
8.9
Self: ARI
Anxiety
Depressive symptoms
Reactive aggression
Oppositional behavior
17
1
Evans et al. (2020b)
1030
Cross-sectional
America
Both (58%)
10.2 (2.4)
Parent: CBCL
Youth: CBCL-YSR
Internalizing Problems
Externalizing Problems
Anxious/Depressed
Withdrawn/Depressed
Somatic Complaints
Social Problems
Thought Problems
Attention Problems
Rule-Breaking
DSM Affective Problems
DSM Anxiety Problems
DSM Somatic Problems
DSM ADHD Problems
DSM Conduct Problems
18
1
Evans et al. (2020c)
346
Longitudinal
America
Both (49%)
5–8
8–11
Teacher: DBDC
Youth DBDC
Defiance
Hyperactivity
Inattention
Depression
18
3
Evans et al. (2022)
206
Cross-sectional
America
Both (52%)
10.73 (2.40)
Caregiver: CBCL
Youth: CBCL-YSR
Emotional Lability
Anger coping
Anger Dysregulation
Internalizing
Externalizing
Attention
17
1
Evans et al. (2016)
706
Cross-sectional
America
Both (51%)
5–12
Teacher: DBD
Defiant
Hyperactive-Impulsive
Inattentive
Proactive Aggression
Reactive aggression
Relational aggression
Physical aggression
Depression
16
1
Eyre et al. (2019)
4874
Longitudinal
England
Both (57%)
7–9
10–16
Parent: DAWBA
Neurodevelopmental difficulties
Depression
18
3
Eyre et al. (2017)
696
Cross-sectional
UK
Both (84%)
10.9 (2.99)
Parent: CAPA
Anxiety
Depression
17
1
Ezpeleta et al. (2012)
622
Cross-sectional
Spain
Both (51%)
3.0 (0.18)
Parent: DICA-PPYC
Disruptive
ADHD
Mood disorders
Minor depression
Anxiety disorders
SAD
Specific phobia
Social phobia
17
1
Ezpeleta et al. (2019)
614
Cross-sectional
Spain
Both (50.2%)
3.8(0.33)
7
Parent: SDQ
Affective problems
Anxiety problems
ODD problems
19
1
Ezpeleta et al. (2020a)
T1: 471
T2: 454
Longitudinal
Spain
T1: Both (49%)
T2: Both (49%)
7.7 (0.36)
11.6 (0.34)
Teacher: ARI
Anger
SDQ-Conduct
SDQ-Emotional
SDQ-Hyperactivity
SDQ-Peer
SDQ-Prosocial
SDQ-Externalizing (Conduct + Hyper)
SDQ-Internalizing (Emotional + Peer)
CAS-Verbal Aggression
CAS-Aggression against objects/animals
CAS-Physical aggression
CAS-Use of weapons
CAS-Aggression to peers
CAS Total
CBCL-Withdrawn/Depressed
CBCL-Anxious/Depressed
CBCL-Attention problems
CBCL-Aggressive behavior
CBCL-Rule-Breaking
ERC-Lability-Negativity
ERC-Emotion regulation
YSR-Withdrawn/Depressed
YSR-Anxious/depressed
YSR-Attention problems
YSR-Aggressive behavior
YSR-Rule-Breaking
AQ-Tolerance to frustration
AQ-External expression
AQ-Anger control
19
3
Ezpeleta et al. (2020b)
Cl1: 332
Cl2: 55
CI3: 108
Total: 495
Longitudinal
Spain
Cl1: Both (52%)
Cl2: Both (53%)
Cl3: Both (47%)
3
11–12
Parent: SDQ
ASR-Anxious/depressed
ASR-withdrawn
ASR-somatic complaints
ASR-thought problems
ASR-Attention problems
ASR-Aggressive behavior
ASR-rule-breaking
ASR-Intrusive
ASR-internalizing
ASR-externalizing
SDQ-emotion
SDQ-conduct
SDQ- hyperactivity
SDQ-peer
SDQ-prosocial
Functional impairment
18
2
Ezpeleta et al. (2022)
563
Cross-sectional
Spain
Both (51%)
6–13
Parent: SDQ
Trajectory-Defiant
Trajectory-OCP
18
1
Farchione et al. (2007)
Target: 300
Control: 169
Cross-sectional
America
Target: Both (52%)
Control: Both (44%)
Target: 12.1 (3.6)
Control: 11.6 (3.5)
Parent: CHI
Self: CHI
Aggression
Hostility
16
1
Fernandez de la Cruz et al. (2015)
579
Cross-sectional
America
Both
(80%)
8.5 (0.8)
Parent SNAP
Withdrawn
Somatic complaint
Anxious/depression
Social problems
Thought problems
Attention problems
Aggressive behavior
Internalizing scale
Externalizing scale
15
1
Filippi et al. (2020)
291
Cross-sectional
America
Both (46%)
2–12
Parent: ARI (12y)
Self: ARI (12y)
Social Anxiety
15
1
Gadow & Drabick (2012)
1127
Cross-sectional
America
Both (70%)
12.1 (3.4)
Parent: CASI-4R
Teacher: CASI-4R
ODD
ADHD (inattentive)
ADHD (hyperactive)
CD
GAD
OCD
Social anxiety
Depressive symptom
Manic
16
1
Galano et al. (2023)
T1: 120
T2: 71
T3: 68
Longitudinal
America
T1: Both (50%)
T2: Both (54%)
T3: Both (57%)
4.94 (0.85)
 + 6–8 months
12.46 (1.77)
Parent: CBCL
Internalizing
Externalizing
Emotion Regulation
Prosocial Behaviour
18
3
Grabell et al. (2020)
79
Cross-sectional
America
Both (52%)
3–7
Parent: MAP-DB
Externalizing
14
1
Guzick et al. (2021)
161
Cross-sectional
America
Both (51%)
7–17
Parent: CBCL
Depressive symptoms
Anxiety
OCD
16
1
Harima et al. (2022)
116
Cross-sectional
Japan
Boys
11.8 (2.6)
Self & Parent Clinical Interview
Internalizing
Externalizing
Anxiety/Depression
20
1
Hawes et al. (2020)
T1: 941
T2: 941
T3: 816
Longitudinal
America
T1: Both (43%)
T2: Both (43%)
T3: Both (41%)
16.6 (1.2)
24
30
Self: K-SADS
Depressive disorder
Anxiety disorders
Substance use disorder
18
6
Kahle et al. (2021)
T1:108
T2: 80
Longitudinal
America
T1: Both (67%)
T2: Both (60%)
12–16
13–17
Parent: CPRS-3
Hyperactivity /Impulsivity
Inattention
19
5
Kalvin et al. (2021)
81
Cross-sectional
America
Both (76%)
8–16
Parent: ARI
Autism
16
1
Kessel et al. (2021)
541
Longitudinal
America
Both (57%)
3.55 (0.43)
12.75 (0.50)
Parent: PAPA
Internalizing
Externalizing
17
2
Kessel et al., (2017)
338
Cross-sectional
America
Both (56%)
3
Parent: PAPA
Depression
Anxiety
Disruptive Behavior Disorder
17
1
Kessel et al. (2016)
T1: 541
T2: 304
Longitudinal
America
Both (57%)
3.55 (0.43)
9.14 (0.32)
Parent: PAPA
Internalizing
Externalizing
16
2
Khurana et al. (2023)
142
Cross-sectional
America
Both (58%)
10.51
Self: ARI
Depression
Suicidality
19
1
Kishida et al. (2022)
1867
Cross-sectional
Japan
Both (53%)
10.53 (2.63)
Parent: ARI
Emotional symptoms
Conduct problems
Hyperactivity/Inattention
Peer relationship problems
Prosocial behavior
17
1
Kolko et al., (2007)
242
Cross-sectional
America
Both (80%)
9.1 (2.0)
Parent: SCAR-H
Teacher: SCAR-S
Aggression
17
1
Kolko & Pardini (2010)
177
Cross-sectional
America
Both (81%)
6–11
Parent & Self: K-SADS
Global functioning
Overall impairment
ADHD
Conduct Disorder
CU traits
ODD (hurtful)
ODD (headstrong)
17
1
Krieger et al. (2013)
2514
Cross-sectional
Brazil
Both (54%)
6–12
DAWBA
Emotional disorders
Anxiety disorder
Major depression
Conduct Disorder
ADHD
Peer problems
Pro-sociality
18
1
Leadbeater & Ames (2017)
662
Longitudinal
Canada
Both (48%)
15.5(1.9)
26.8
Parent: BCFPI
Internalizing symptoms
Conduct problems
ADHD symptoms
19
6
Lee et al. (2023)
285
Longitudinal
Taiwan
Both (49%)
9.9 (0.6)
6 months later
9 months later
Parent: CBCL
Anxiety
19
3
Legenbauer et al. (2018)
91
Cross-sectional
Germany
Both (30%)
13.98 (1.31)
26.8(2.0)
Self: ARI
Affective dysregulation
17
1
Leibenluft et al. (2006)
T1: 776
T2: 776
T3: 717
Longitudinal
America
Both (50%)
13.8 (2.6)
16.2 (2.8)
Parent: DISC
Self: DISC
ADHD
Conduct Disorder
ODD
Depression
GAD
OCD
Simple phobia
Social phobia
Mania
17
5
Leigh et al. (2020)
T1: 165
T2: 156
Cross-sectional
England
Both (57%)
12–14
Self: ARI
Depressive rumination
Angry rumination
14
1
Lengua (2006)
T1: 214
T2: 204
Longitudinal
America
Both (45%)
9.48 (1.01)
 + 3 years
Parent: EATQ
Internalizing
Externalizing
17
3
Lengua & Kovacs (2005)
92
Longitudinal
America
Both (54%)
7.8–11.9
9–13
Self: EATQ
Parent: EATQ
Internalizing symptoms
Externalizing symptoms
16
3
Levy et al. (2020)
1516
Cross-sectional
Canada
Both (74%)
9.00 (2.19)
Parent: OCHS-R
Suicidality
16
1
Liu et al. (2024)
535
Cross-sectional
China
Both (51%)
10.01 (1.42)
Self: EATQ-R
Depression
18
1
Loram et al., (2021)
82
Cross-sectional
Australia
Both (88%)
14.33 (1.38)
Parent: ARI
Self: ARI
ADHD
18
1
Maire et al. (2020)
98
Cross-sectional
France
Both (81%)
7–11
Parent: CPRS-3
Inattention
Hyperactivity
Opposition
Anxiety
16
1
Martin et al. (2017)
139
Cross-sectional
America
Both (76%)
4–5
Parent: DIPA
Emotionally reactive
Anxious/depressed
Withdrawn
Attention problems
Aggressive behavior
ODD
MDD
ADHD
Anxiety disorder
PTSD
16
1
Mikolajewski et al. (2017)
2450
Longitudinal
America
Both (49%)
11.38
17
Parent: DICA-R
Internalizing symptoms
MDD
Externalizing symptoms
Specific phobia
Panic disorder
Adult antisocial behavior
Alcohol use disorder
17
3
Mulraney et al. (2014)
62
Cross-sectional
Australia
Both (39%)
15.29 (1.32)
Parent: ARI
Emotional problems
Conduct problems
Hyperactivity
Peer problems
Prosocial
12
1
Mulraney et al. (2017)
140
Longitudinal
Australia
Both (89%)
5–13
12–17
Parent: ARI
Self: ARI
ADHD
14
3
Naim et al. (2021)
109
Cross-sectional
America
Both (72%)
8–18
Parent: ARI
Self: ARI
DMDD
ADHD
Anxiety
16
1
Nelson et al. (2018)
69
Cross-sectional
America
Both (37%)
9–14
Parent: ARI
Self: ARI
Anxiety
Depression
Stress
17
1
Pan & Yeh (2019)
97
Cross-sectional
Taiwan
Both (73%)
6–17
Parent: ARI
Self: ARI
Aggression
Anxiety/depression
Social problems
15
1
Perhamus & Ostrov (2021)
300
Longitudinal
America
Both (56%)
3.7(0.37)
7
Parent: CBQ-TF
Reactive physical aggression
Proactive physical aggression
18
2
Poznanski et al. (2018)
435
Cross-sectional
America
Both (47%)
12.7 (3.0)
Parent: CBCL
Anxiety severity
Depressive disorder severity
Sleep problems
ADHD/DBD severity
17
1
Rappaport et al. (2020)
374
Cross-sectional
America
Not reported
9–14
Self: ARI
Depression
GAD
Separation anxiety
Social anxiety
Panic disorder symptoms
14
1
Rice et al. (2017)
337
Cross-sectional
England
Both (42%)
12.4 (2.00)
14
CAPA
Depression
15
1
Rowe et al. (2010)
1420
Longitudinal
America
Both (56%)
9–13
13–16
Parent: CAPA
Conduct Disorder
ODD
Substance use disorder
Anxiety
Depression
16
3
Rubens et al. (2017)
285
Cross-sectional
America
Both (48%)
8–11
Self: ARI
Anxiety
Depression
Emotion dysregulation
Delinquency
Reactive aggression
Proactive aggression
15
1
Silver et al. (2021)
550
Longitudinal
America
Girls
14.37 (0.62)
 + 3 years
Self: IPIP, BPAQ, TAI
Depression
Panic disorder
GAD
Social phobia
Specific phobia
ODD
Conduct Disorder
Substance use disorder
16
3
Silver et al. (2024)
418
Cross-sectional
America
Both (57%)
12.66 (0.46)
15.25 (0.41)
18.37 (0.54)
Self: ARI
Parent: ARI
Suicidal ideation
Depressive disorder
Anxiety disorder
DBD
ADHD
20
1
Smith et al. (2019)
731
Longitudinal
America
Both (51%)
2–5
7.5 – 10.5
Parent: CBCL
Externalizing
Internalizing
ODD
GAD
MDD
14
2
Sorcher et al. (2022)
212
Longitudinal
America
Both (53%)
3.51 (0.26)
15.25 (0.40)
Parent: PAPA
Depression
Anxiety
Specific phobia
Social phobia
Separation anxiety
GAD
ADHD
DBD
Self-harm
Suicidal ideation
Global functioning
16
2
Srinivasan et al., (2024)
7225
Longitudinal
England
Both (49%)
3
5
14
SDQ
CSBQ
Depressive symptoms
18
2
Stoddard et al. (2017)
115
Cross-sectional
England
Both (56%)
8–17
Parent: ARI
Anxiety
16
1
Stringaris & Goodman (2009a)
Total:18,298
4278 (Parent)
14,020 (Teacher)
Cross-sectional
England
Both (57%)
Both (50%)
10.4 (3.3)
10.6 (3.2)
Parent: DAWBA
Teacher: DAWBA
Emotional problems
Hyperactivity
Conduct problem
Peer problems
18
1
Stringaris & Goodman (2009b)
7912
Longitudinal
England
Both (52%)
10.2 (3.3)
13.2 (3.3)
Parent: DAWBA
Internalizing disorders
ADHD
Conduct Disorder
Distress disorders
16
3
Stringaris et al. (2012)
306
Longitudinal
England
Both (42%)
15
17
Self ASEBA
Depression
Delinquency
18
5
Theriault et al. (2018)
58
Longitudinal
Canada
Both (85%)
10.3 (2.6)
19.7 (2.5)
Parent: DSM-IV clinician interview
Chronic tic and anxiety
Chronic tic and compulsive symptoms
18
6
Ucar & Vural (2018)
86
Cross-sectional
Turkey
Both (68%)
13.72 (1.34)
Parent: ARI
Self: ARI
ADHD
16
1
Valencia et al. (2021)
470
Longitudinal
Spain
Both (50%)
8
11
Parent: SDQ
Internalizing symptoms
17
2
Vogel et al. (2019)
302
Longitudinal
America
Both (52%)
3–5
16–19
Parent: PAPA
ADHD
ODD
Conduct disorder
14
3
Wakschlag et al. (2015)
497
Longitudinal
America
Both (50%)
2.9—6
3.1 – 7.7
3.8 – 8.5
Parent: MAP-DB Temper loss scale
ODD symptoms
CD symptoms
ADHD symptoms
Depression symptoms
GAD symptoms
Social anxiety symptoms
19
2
Wakschlag et al. (2020)
151
Cross-sectional
America
Both (53%)
4.82 (0.60)
Parent: MAP-DB Temper loss scale
Internalizing
Externalizing
15
1
Wang et al. (2023)
323
Longitudinal
China
Both (50%)
8.29 (0.47)
1 year later
2 years later
Parent: CBQ
GAD
18
3
Waschbusch et al. (2020)
219
Cross-sectional
America
Both (79%)
9.53 (1.57)
Parent & Teacher (Combined): DBDRS
Psychopathology
Aggression
Peer problems
Impairment
14
1
Waxmonsky et al. (2022)
48
Cross-sectional
America
Both (69%)
8.08 (2.09)
Parent: ARI
ADHD
ODD
CD
Callous-unemotional
17
1
Waxmonsky et al. (2017)
S1: 665
S2: 784
Total: 1449
Cross-sectional
America
S1: Both (53%)
S2: Both (68%)
6–12
Parent: PBS
Oppositional behavior
Hyperactive-Impulsive
Conduct problem
Anxiety
Depression
Inattention
17
1
Whelan et al. (2015)
3963
Longitudinal
United Kingdom
Not reported
2
10
13
Mother & Teacher: DAWBA
Anxiety/depression
Conduct problems
Depression at 16y
19
3
Wiggins et al. (2023)
425
Longitudinal
America
Both (49%)
4.7 (0.85)
7.1 (1.1)
9.3
(0.79)
Parent: MAPS-TL
Any disorder
Externalizing
Internalizing
16
2
Wilson et al. (2022)
115
Cross-sectional
America
Both (48%)
5.56 (1.7)
3–8
Parent: ARI
Anxiety
Anxious/depressed
Aggression
Attention
17
1
Zendarski et al. (2023)
51
Cross-sectional
Australia
Both (53%)
11.17 (2.5)
  
Parent: ARI
Self: ARI
Internalizing
Externalizing
ADHD
ASD
18
1
Zhou et al. (2009)
S1: 382
S2: 322
Total: 704
Cross-Sectional
Chinese/USA
S1: Both (44%)
S2: Both (47%)
S1: 11.6 (0.6)
S2: 9.6 (1.0)
S1 Parent/ Teacher: CBQ
S2 Parent/ Teacher: EATQ
Attention
Externalizing
Internalizing
18
1
Zik et al. (2022)
195
Cross-sectional
America
Both (59%)
13.16 (2.48)
Parent: ARI
Self: ARI
Aggression
Anger
16
1
ARI Affective Reactivity Index, ASEBA Achenbach System of Empirically Based Assessment, BCFPI Brief Child and Family Phone Interview, BiTe Brief Irritability Test, BPAQ Buss-Perry Aggression Questionnaire, CAPA The Child and Adolescent Psychiatric Assessment, CASI Child and Adolescent Symptom Inventory, CBCL Child Behavior Checklist, CBCL-YSR Child Behavior Checklist Youth Self Report, CBQ-TF Children's Behavior Questionnaire—Short Form, CHI Children Hostility Inventory, CIS Caprara Irritability Scale, CPRS-R Conners’ Parent Rating Scale, CSBQ Child Social Behavior Questionnaire, CSI-IV Child Symptom Inventory, DAWBA Development and Well-Being Assessment, DBDC Disruptive Behavior Disorder Checklist, DBDRS The Disruptive Behavior Disorders Rating Scale, DICA-R Diagnostic Interview for Children and Adolescents, DIPA Diagnostic Infant and Preschool Assessment, DISC Diagnostic Interview Schedule for Children, EATQ Early Adolescent Temperament Questionnaire, HiPIC The Hierarchical Personality Inventory for Children, IPIP = International Personality Item Pool, K-SADS-P Schedule for affective disorders and schizophrenia for school-age children-present episode, K-SADS-PL Schedule for affective disorders and schizophrenia for school-age children-present and lifetime version, LAB-TAB Laboratory Temperament Assessment Battery, MAP-DP Multidimensional Assessment of Preschool Disruptive Behavior, MINI-KID The Mini-International Neuropsychiatric Interview for Children and Adolescents, OCHS-R The Ontario Child Health Survey Scales-Revised, PAPA The Preschool Age Psychiatric Assessment, PBS Pediatric Behavior Scale, SCAR Screen for Children Affective Reactivity, SDQ Strengths and Difficulties Questionnaire, SNAP Swanson, Nolan, and Pelham rating scale, TAI Temperament and Affectivity Inventory. Model Key: 1 Concurrent (all childhood), 2 Longitudinal (preschool to childhood), 3 Longitudinal (childhood to later childhood/adolescence), 4 Longitudinal (childhood to adulthood), 5 Longitudinal (adolescence to adolescence), 6 Longitudinal (adolescence to adulthood)

Concurrent Associations (Model 1)

Irritability and overall mental health symptoms. The analysis of studies reporting concurrent data showed a positive association between irritability and overall mental health symptoms, k = 417, r = 0.33 (95% CI 0.29, 0.36). Forest and Funnel plots are available as supplementary materials (Fig. S6a and S6b). Egger’s regression was non-significant, indicating no publication bias, t(415) = 1.23, p = 0.22. Heterogeneity was found across the models, I2 > 98, with a significant Q statistic, thereby supporting further tests of potential moderators. For studies reporting on concurrent associations, study quality was significant k = 417, χ2(1) = 4.45, p = 0.03, R2 = 0.01, indicating that as the study quality increased, the association between irritability and mental health decreased (see Supplementary file, Figure S6c). Other moderators were non-significant: age (k = 417, χ2(1) = 0.33, p = 0.56, R2 = 0.00); informant type (k = 417, χ2(5) = 9.92, p = 0.07, R2 = 0.02), and sex (k = 412, χ2(1) = 1.79, p = 0.18, R2 = 0.00). A sensitivity analysis was conducted to examine whether results varied according to measure of irritability. The fixed effects model (k = 417, r = 0.31 (95% CI 0.31, 0.31)) and the random effect models (k = 417, r = 0.28 (95% CI 0.26, 0.29)) did not differ significantly (p = 0.64), indicating that the measure of irritability did not significantly influence the results.
Irritability and externalizing/internalizing symptoms. Analysis of concurrent data showed a positive association between irritability and internalizing symptoms k = 189, r = 0.29 (95% CI 0.27, 0.32), and a positive association with externalizing symptoms, k = 181, r = 0.37 (95% CI 0.31, 0.43). In meta-regression testing symptom dimensions as moderators, the effect size for externalizing symptoms was significantly greater than for internalizing symptoms k = 370, χ2(1) = 4.21, p = 0.04, R2 = 0.01 (see Supplementary file, Fig. S6d).
Irritability and diagnostic domains. Subgroup analysis conducted on effect sizes for concurrent associations between irritability and diagnostic domains were as follows: anxiety, k = 73, r = 0.22 (95% CI 0.21, 0.23); depression, k = 47, r = 0.28 (95% CI 0.27, 0.29); ADHD, k = 77, r = 0.26 (95% CI 0.20, 0.31); ASD, k = 6, r = 0.10 (95% CI − 0.01, 0.21); CD, k = 23, r = 0.36 (95% CI 0.35, 0.37); ODD, k = 29, r = 0.63 (95% CI 0.63, 0.64); SUD k = 2, r = 0.49 (95% CI− 0.40, 0.58); and OCD, k = 5, r = 0.14 (95% CI 0.09, 0.18). Meta-regression showed that the effect size for ODD was significantly greater than other diagnostic domains, k = 260, χ2(6) = 94.25, p = 0.00, R2 = 0.28 (see Supplementary file, Fig. S6e).

Longitudinal Associations: Preschool to Middle Childhood (Model 2)

Irritability and overall mental health symptoms. The analysis of longitudinal studies showed a positive association between preschool irritability and overall mental health symptoms in middle childhood, k = 65, r = 0.21 (95% CI 0.18, 0.24). Forest and Funnel plots are available as supplementary materials (Figure S6f and S6g). Egger’s regression was significant, indicating publication bias, t(63) = 7.39, p = 0.00. Heterogeneity was found across the models, I2 > 85 and the Q statistic significant, thereby supporting tests of potential moderators. Age (k = 65, χ2(1) = 0.03, p = 0.87, R2 = 0.00), sex (k = 65, χ2(1) = 0.58, p = 45, R2 = 0.0), study quality (k = 65, χ2(1) = 1.27, p = 0.32, R2 = 0.01) and informant type (k = 65, χ2(3) = 5.60, p = 0.13, R2 = 0.01) were tested as moderators and found to be non-significant. Due to the small number of measures of irritability in these studies, a moderation analysis, rather than sensitivity analysis, was conducted to examine variation based on type of measure. The model was also non-significant (k = 65, χ2(6) = 11.32, p = 0.08, R2 = 0.18), indicating that factors other than measurement type, age, sex, study quality, and informant type may account for heterogeneity in the model.
Irritability and externalizing/internalizing symptoms. A subgroup analysis of preschool irritability and mental health outcomes in middle childhood indicated comparable effect sizes for internalizing symptoms k = 26, r = 0.18 (95% CI 0.13, 0.22) and externalizing symptoms, k = 30, r = 0.23 (95% CI 0.18, 0.27). Meta-regression analysis testing these symptom dimensions as moderators showed no significant difference (k = 56, χ2(1) = 2.64, p = 0.10, R2 = 0.05).
Irritability and diagnostic domains. In a subgroup analysis conducted on the association between preschool irritability and middle childhood diagnostic domains, effect sizes were as follows: anxiety k = 8, r = 0.11 (95% CI 0.07, 0.14); depression, k = 9, r = 0.13 (95% CI 0.06, 0.20); ADHD, k = 9, r = 0.16 (95% CI 0.10, 0.23); CD, k = 6, r = 0.22 (95% CI 0.10, 0.35); and ODD, k = 6, r = 0.25 (95% CI 0.19, 0.31). Meta-regression found a significant difference across diagnostic domains (k = 38, χ2(1) = 11.59, p = 0.02, R2 = 0.29), whereby effect sizes for CD were larger than for anxiety (see Supplementary file, Fig. S6h).

Longitudinal Associations: Middle Childhood to Late Childhood/Adolescence (Model 3)

Irritability and overall mental health symptoms. This analysis showed a positive association between irritability in middle childhood and mental health symptoms in later childhood/adolescence, k = 39, r = 0.14 (95% CI 0.11, 0.17). Forest and Funnel plots are available as supplementary materials (Figure S6i and S6j). Egger’s regression was significant, indicating publication bias, t(37) = 2.54, p = 0.00. Heterogeneity was found across the models, I2 > 85 and the Q statistic significant, thereby supporting tests of potential moderators. Age (k = 39, χ2(1) = 0.56, p = 0.46, R2 = 0.02), sex (k = 38, χ2(1) = 0.52, p = 0.47, R2 = 0.00), study quality (k = 39, χ2(1) = 3.63, p = 0.06, R2 = 0.11), and informant type (k = 34, χ2(1) = 3.88, p = 0.27, R2 = 0.08), were tested as moderators and found to be non-significant. Due to the small number of measures of irritability in these studies, a moderation analysis, rather than sensitivity analysis, was conducted to examine variation based on type of measure. The model was significant (k = 29, χ2(9) = 26.64, p = 0.00, R2 = 0.55), indicating that effect sizes for studies using the Affective Reactivity Index (ARI) were significantly larger than those using the CBQ, DAWBA, DICA, DISC, the Disruptive Behavior Disorder Checklist (DBDC), the Child and Adolescent Psychiatric Assessment (CAPA), and the Strengths and Difficulties Questionnaire (SDQ) (see Supplementary file, Figure S6k).
Irritability and externalizing/internalizing symptoms. Effect sizes were as follows for externalizing, k = 10, r = 0.13 (95% CI 0.03, 0.22), and internalizing symptom dimensions, k = 25, r = 0.14 (95% CI 0.10, 0.18). Meta-regression analysis testing these symptom dimensions as moderators showed no significant difference (k = 35, χ2(1) = 0.04, p = 0.85, R2 = 0.00).
Irritability and diagnostic domains. In a subgroup analysis conducted on the association between middle childhood irritability and diagnostic domains in later childhood/adolescence, effect sizes were as follows: anxiety, k = 12, r = 0.14 (95% CI 0.08, 0.19); depression, k = 13, r = 0.15 (95% CI 0.09, 0.20); CD, k = 4, r = 0.14 (95% CI − 16., 0.41); and ODD, k = 4, r = 0.16 (95% CI 0.04, 0.26). Meta-regression indicated no significant differences between diagnoses k = 36, χ2(5) = 0.30, p = 0.99, R2 = 0.01.

Longitudinal Associations: Middle Childhood to Adulthood (Model 4)

Irritability and overall mental health symptoms. This model could not be run due to insufficient data. Available data were integrated with model 6.

Longitudinal Associations: Early Adolescence to Late Adolescence (Model 5)

Irritability and overall mental health symptoms. A positive association was found between irritability in early adolescence and mental health symptoms in later adolescence, k = 11, r = 0.21 (95% CI 0.15, 0.28). Forest and Funnel plots are available as Supplementary materials (Fig. S6l and S6m). Egger’s regression was significant, indicating potential publication bias, t(9) = 2.95, p = 0.02. Heterogeneity across the models, I2 > 60, and a significant Q statistic, supported moderation analysis. Age was found to be a significant moderator, k = 11, χ2(1) = 12.00, p = 0.00, R2 = 0.93 (see Supplementary file, Fig. S6n), such that as age increased, the effect size for overall mental health symptoms was larger. Informant type (youth self-report; parent report) was significant, k = 11, χ2(1) = 12.00, p = 0.00, R2 = 0.93 (see Supplementary file, Fig. S6o), whereby effect sizes for youth self-reports were larger than parent-reports. A significant moderation effect was also found for sex, k = 11, χ2(1) = 8.35, p = 0.00, R2 = 0.88, indicating smaller effects for samples with more boys (see Supplementary file, Fig. S6p). No moderator effect was found for study quality (k = 11, χ2(1) = 1.00, p = 0.32, R2 = 0.27).
Due to the small number of measures of irritability in these studies, a moderation analysis, rather than sensitivity analysis, was conducted to examine variation based on type of measure. The model was significant (k = 11, χ2(2) = 12.02, p = 0.00, R2 = 0.93), indicating that effect sizes for studies using the ASEAB were significantly greater than those using the DISC in this age group (see Supplementary file, Figure S6q).
Irritability and externalizing/internalizing symptoms. Effect sizes were as follows for externalizing, k = 4, r = 0.27 (95% CI 0.23, 0.31) and internalizing symptom dimensions, k = 5, r = 0.17 (95% CI 0.03, 0.31). The number of available studies was not sufficient for meta-regression analysis.
Irritability and diagnostic domains. In a subgroup analysis conducted on the association between irritability and diagnostic domains, effect sizes were as follows: anxiety, k = 3, r = 0.11 (95% CI − 0.02, 0.38); depression, k = 2, r = 0.27 (95% CI 0.09, 0.43); ADHD k = 2, r = 0.17 (95% CI − 0.06, 0.38); CD, k = 1, r = 0.19 (95% CI − 16, 0.41); and ODD, k = 2, r = 0.25 (95% CI − 0.02, 0.49). A meta-regression conducted with ODD as the intercept indicated a significant difference compared to anxiety k = 10, χ2(4) = 19.16, p = 0.01, R2 = 1.00 (see Supplementary File S6r).

Longitudinal Associations: Adolescence to Adulthood (Model 6)

Irritability and overall mental health symptoms. A positive association was found between irritability in adolescence and mental health symptoms in adulthood, k = 9, r = 0.25 (95% CI 0.12, 0.37). Forest and Funnel plots are available as Supplementary materials (Figure S6s and S6t). Egger’s regression was significant, suggesting publication bias, t(7) = 2.23, p = 0.06. The number of available studies was not sufficient for meta-regression analysis.
Irritability and externalizing/internalizing symptoms. Effect sizes were as follows for externalizing, k = 3, r = 0.39 (95% CI 0.32, 0.46), internalizing symptom dimensions, k = 5, r = 0.05 (95% CI − 0.00, 0.09). The number of available studies was not sufficient for meta-regression analysis.
Irritability and diagnostic domains. No subgroup analysis was conducted due to insufficient data.

Discussion

Evidence regarding irritability and mental health has grown rapidly in recent years, and the current meta-analysis is the first to examine irritability across childhood and adolescence as it relates to mental health symptoms during these periods. Findings demonstrated a significant and positive association between irritability and severity of concurrent overall psychopathology in the order of a moderate effect size, while small to moderate effect sizes characterized the association between irritability and later mental health outcomes in studies with prospective designs. Notwithstanding the significant relationship between irritability and overall severity of mental health symptoms, this association was also found to differ somewhat according to symptom type. This was evident both at the level of broad dimensions of internalizing versus externalizing symptoms, as well as symptom domains based on more specific diagnostic categories.
The association between irritability and concurrent problem severity was most pronounced for externalizing problems, which demonstrated a significantly greater association with irritability than internalizing problems in concurrent data. Data on concurrent associations are particularly relevant to the conceptualization of irritability in diagnostic models, especially models of disorders in which irritability forms a core phenotypic feature (Evans et al., 2021a). When externalizing problems were broken down further into more distinct diagnostic domains, symptoms of ODD showed the most pronounced association with irritability, relative to other diagnostic domains including CD. This is understandable given that diagnostic criteria for ODD include an angry/irritable mood symptom dimension (APA, 2013), and factor analytic research has provided strong support for the inclusion of this dimension in the overall structure of ODD (Burke et al., 2014).
Prospectively, irritability was associated with greater mental health symptoms across each of the developmental periods examined. Consistent with the data on concurrent associations, and the conceptualization of irritability as a transdiagnostic construct, these positive longitudinal associations were seen for both externalizing and internalizing symptoms. Prospective associations between irritability and each of these broad symptom dimensions were highly comparable, yet these prospective associations were once again more prominent for diagnostic features of externalizing problems, in terms of ODD and CD specifically. This is noteworthy given that current diagnostic criteria for CD do not explicitly refer to irritability. It is nonetheless consistent with evidence regarding the highly overlapping nature of the symptoms represented by ODD and CD, which have been conceptualized as part of a broader externalizing spectrum also encompassing ADHD, substance use disorder, and antisocial personality disorder. Although irritability is often not explicitly named in the diagnostic criteria for these disorders, all are understood to be associated with irritability. Moreover, irritability is implicated in the common liabilities from which these disorders are thought to arise, such as trait impulsivity (Lahey et al., 2011). In terms of the neurodevelopmental underpinnings of such impulsivity, it has been proposed that irritability reflects a chronically aversive mood state driven by subcortical dysfunction in the mesolimbic dopamine system, which in turn motivates individuals to engage in reward-seeking behaviors (Beauchaine et al., 2017).
As a transdiagnostic factor that is understood to reflect emotion dysregulation, irritability may help explain the high rates of comorbidity between diverse forms of internalizing and externalizing disorders in the population. CD for example, frequently co-occurs with depression and anxiety, particularly among girls (Fairchild et al., 2019). Emerging research has pointed to mechanisms that may account for the diverse forms of psychopathology that arise from the common starting point of irritability, reflecting the principle of multifinality in developmental psychopathology. For example, variations in stress system functioning (diurnal cortisol slopes) have been found to differentiate developmental trajectories of early childhood irritability that lead to internalizing versus externalizing symptoms in early adolescence (Kessel et al., 2021).
Interestingly, in our data the specific pattern of prospective associations with diagnostic features varied somewhat across distinct developmental periods, such that early childhood irritability was more strongly associated with features of CD across middle childhood, whereas irritability in early adolescence was most strongly associated with features of ODD across adolescence. This raises important questions regarding developmental changes in the relationship between irritability and distinct risk pathways over time. These findings could be seen as analogous to the notion that distinct dimensions of ODD symptoms, including irritable mood, may vary in relation to one another across development, as has been subject to some speculation (Burke & Loeber, 2010). Although research testing this directly has generally supported the structural invariance of ODD dimensions across development (Jungersen & Lonigan, 2022; Lavigne et al., 2015), further investigation is warranted. There is a particular need for further longitudinal studies of irritability in late childhood and early adolescence as a predictor of subsequent mental health symptoms across adolescence and early adulthood, given that the number of such studies currently available precluded tests of moderation by symptom type across these periods.
In addition to the developmental perspective provided by these results, our tests of age as a moderator variable provided some evidence that irritability may become more strongly associated with overall mental health problems as children and adolescents get older. Specifically, within adolescence (age range 13–18 years), an older age was associated with a larger effect size. This should be interpreted with caution, however, as it may in part reflect that the testing interval for older adolescents would have been shorter than for younger adolescents in this model. Based on the broad range of neurocognitive domains that have been implicated in irritability-related risk mechanisms (e.g., cognitive control; reward processing; Elvin et al., 2024), it is important to consider how cog-nitive development may influence the relationship between irritability and symptoms of psychopathology. Recent research has identified developmental trajectories of irritability that appear to be differentially associated with clinical outcomes, and there is a need for further developmental research into the multilevel (e.g., cognitive, genetic, environment) mechanisms underlying these trajectories (Leibenluft et al., 2024).
Our search indicated a need for research to investigate irritability as a distinct treatment outcome variable, which remains limited to date. Considerable support is nonetheless available for the effects of parenting interventions on irritability within the symptom profile of ODD (Hawes et al., 2023, Stringaris et al., 2018). Recent research has also supported the potential for such intervention, and cognitive behavior therapy, to reduce transdiagnostic features of irritability in the context of modular approaches (Evans et al., 2021b). Emerging evidence regarding interplay between child characteristics and environmental factors such as quality of parenting further suggests that irritability may be implicated in a temperament profile associated with differential susceptibility to the environment (Belsky et al., 2007). For example, children with a profile characterized by temperamental traits of high irritability, approach, activity, and impulsivity appear to be more vulnerable to externalizing problems when exposed to negative maternal parenting, compared to children without this profile, but these same children also appear to benefit more than other children when exposed to positive maternal parenting (Hentges et al., 2023). Moreover, irritability may in some instances reflect a vantage sensitivity, accounting for individual differences in response to parenting interventions (de Villiers et al., 2018).
The findings of our meta-analysis should be interpreted in light of some limitations. First, the studies from which data were extracted were conducted largely in Western, educated, industrialized, rich, and democratic (WEIRD) populations (Henrich et al., 2010), and therefore generalizability of results across cultures and regions is unclear. Populations from Asia and Africa were particularly under-represented. Second, the funnel plots produced for our models indicated some risk of publication bias, suggesting that the overall effect sizes produced may be somewhat inflated. Third, like the meta-analytic review by Finlay-Jones et al. (2024), our literature search was limited to English-language publications. Finally, heterogeneity estimates were high for many of the models tested, which may be due to diverse measures of irritability used across studies, in addition to inconsistent approaches to controlling for factors such as age, sex, and baseline mental health symptoms. Notwithstanding these limitations, our design and methodology reflects strengths including a specific focus on studies that have indexed irritability in isolation from overlapping constructs such as negative emotionality, and the examination of the construct across childhood and adolescence. One of the most common measures of irritability across these studies was the Affective Reactivity Index, as recognized in DSM-5 as a gold-standard measure of the construct, and our meta-analysis is the first to include the extensive child and adolescent research that has been conducted with this measure in the past decade.

Conclusions

In conclusion, our findings demonstrate a positive association between child and adolescent irritability and symptoms spanning internalizing, externalizing, and neurodevelopmental disorders, supporting conceptualizations of irritability as a transdiagnostic form of emotion dysregulation (Beauchaine & Tackett, 2020; Klein et al., 2021; Leibenluft et al., 2024). These findings are also consistent with recent meta-analytic evidence regarding irritability in infancy and early childhood, which was used to argue that early irritability represents a marker for neurodevelopmental vulnerability to mental health problems later in life (Finlay-Jones et al., 2024). Our findings regarding the relative association between irritability and distinct mental health symptoms, particularly features of ODD and CD, have important implications for developmental and diagnostic models of psychopathology, and the conceptualization of emotion dysregulation in such problems. At the same time, much remains to be learned about the mechanisms through which irritability confers risk for psychopathology across development, including the transactional dynamics by which irritability and contextual factors may shape one another over time, as well as intervention practices for targeting irritability in its own right.

Declarations

Disclosure of potential conflicts of interest

The authors declare that they have no conflicts of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.
Because this article is a review, informed consent is not applicable.
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Metagegevens
Titel
Irritability as a Transdiagnostic Construct Across Childhood and Adolescence: A Systematic Review and Meta-analysis
Auteurs
Miriam Chin
Davina A. Robson
Hannah Woodbridge
David J. Hawes
Publicatiedatum
20-01-2025
Uitgeverij
Springer US
Gepubliceerd in
Clinical Child and Family Psychology Review / Uitgave 1/2025
Print ISSN: 1096-4037
Elektronisch ISSN: 1573-2827
DOI
https://doi.org/10.1007/s10567-024-00512-4