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Is The Phq-9 A Unidimensional Measure Of Depression? A 58,272-Participant Study, Renzo Bianchi, Jay Verkuilen, Sharon Toker, Irvin Sam Schonfeld, Markus Gerber, Elmar Brähler, Kurt Kroenke
Is The Phq-9 A Unidimensional Measure Of Depression? A 58,272-Participant Study, Renzo Bianchi, Jay Verkuilen, Sharon Toker, Irvin Sam Schonfeld, Markus Gerber, Elmar Brähler, Kurt Kroenke
Publications and Research
The PHQ-9 has become a measure of reference in depression research and clinical practice. However, the issue of the PHQ-9’s unidimensionality has not been fully elucidated, and the usability of the PHQ-9’s total score requires clarification. In this study, we examined the dimensionality, scalability, and monotonicity properties of the PHQ-9 as well as the scale’s total-score reliability. We did so based on exploratory structural equation modeling (ESEM) bifactor analysis and Mokken scale analysis (MSA). We relied on a total of 58,272 participants (63% female; Mage = 43, SDage = 13) from 29 samples involving seven different countries (e.g., Germany, the …
Occupational Depression In A Spanish-Speaking Sample: Associations With Cognitive Performance And Work-Life Characteristics, Bianchi Renzo, Guadalupe Manzano García, Maria Pilar Montanes, Emily A. Schonfeld, Irvin Sam Schonfeld
Occupational Depression In A Spanish-Speaking Sample: Associations With Cognitive Performance And Work-Life Characteristics, Bianchi Renzo, Guadalupe Manzano García, Maria Pilar Montanes, Emily A. Schonfeld, Irvin Sam Schonfeld
Publications and Research
This 386-participant study investigated the structural and psychometric properties of the Spanish version of the Occupational Depression Inventory (ODI). Exploratory structural equation modeling bifactor analysis revealed that the ODI meets the requirements for essential unidimensionality. Measurement invariance held across our sample and the English- and French-speaking samples used in the ODI’s initial validation study. Mokken scale analysis indicated that (a) the scalability of the instrument was strong, (b) no violations of monotonicity or local independence were present, and (c) invariant item ordering was sufficiently accurate. The ODI’s reliability was optimal. The ODI exhibited both convergent validity and discriminant validity vis-à-vis …