Psychometric properties of the 16-item Quick Inventory of Depressive Symptomatology: a systematic review and meta-analysis

Effective management of depression is predicated upon reliable assessment. The Quick Inventory of Depressive Symptomatology (QIDS) is a depression severity scale with both self-rated (QIDS-SR16) and clinician-rated (QIDS-C16) versions. Although widely used in research, the psychometric properties of the QIDS16 have not been systematically reviewed. We performed a systematic review of studies of the psychometric properties (factor structure, internal consistency, convergent validity, discriminant validity, test-retest reliability and responsiveness to change) of the QIDS-SR16 or QIDS-C16. Six databases were searched: MEDLINE, EMBASE, PsycINFO, CinAHL, Web of Science and the Cochrane Central Register of Controlled Trials. Findings were summarised, bias assessed and correlations with reference standards were pooled. 37 studies (17,118 participants) were included in the review. Both versions of the QIDS16 were unidimensional. Cronbach's alpha ranged from 0.69 to 0.89 for the QIDS-SR16 and 0.65 to 0.87 for the QIDS-C16. The QIDS-SR16 correlated moderately to highly with several depression severity scales. Seven studies were pooled where QIDS-SR16 was correlated with the HRSD-17 (r = 0.76, CI 0.69, 0.81) in patients diagnosed with depression. Four studies examined convergent validity with the QIDS-C16. Four studies examined discriminant validity, for the QIDS-SR16 alone. Eighteen studies had at least one author who was a co-author of the original QIDS16 study. Most studies were conducted in the USA (n = 26). The QIDS-SR16 and the QIDS-C16 are unidimensional rating scales with acceptable internal consistency. To justify the use of the QIDS16 scale in clinical practice, more research is needed on convergent and discriminant validity, and in populations outside the USA.

Sexual Coercion and Psychological Aggression Victimization: Unique Constructs and Predictors of Depression

Sexual coercion of women is a common problem in couples that is often conceptualized as a facet of sexual assault or as a form of psychological aggression. Because psychological aggression is consistently linked to depressive symptoms, the researchers evaluated the unique contribution of sexual coercion victimization in the prediction of depressive symptoms beyond the variance explained by psychological aggression victimization. Sample 1 consisted of women living with a partner for at least a year and parenting a young child, whereas Sample 2 consisted of undergraduate students in relationships of at least 6 months. Overall, 27.4% of the women in Sample 1 and 22.8% of the women in Sample 2 reported experiencing sexual coercion victimization. Across both samples, depressive symptoms and psychological aggression victimization were significantly greater in women who experienced sexual coercion victimization. In addition, sexual coercion victimization and psychological aggression victimization each contributed significantly and uniquely to the prediction of depressive symptoms. Thus, although related to psychological aggression victimization, sexual coercion in an intimate relationship is a distinct construct. Implications for assessment, prevention, and couple therapy are discussed.