Is the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF) a unidimensional or bidimensional instrument?

The Quality of Life Enjoyment and Satisfaction Questionnaire (Q-LES-Q) is among the most frequently used outcome measures in psychiatry research [1]. It is a generic, self-reported QOL measure assessing the physical health, subjective feelings, leisure activities, social relationships, general activities, satisfaction with medications and life-satisfaction domains. The Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF) was developed as an index from the original, long form, fully representing its concept [1, 2]. In the most recent psychometric study, the Chinese version of the Q-LES-Q-SF was evaluated [3]. The authors approached its validity in one new way—studying factorial structure using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). This approach resulted in one interesting finding that the measure has psychosocial and physical dimensions. However, this finding could be biased. …