Why the study?
Studies testing alternative model structures of the PHQ-9 supported a two-dimensional structure of somatic and cognitive-affective symptoms rather than a single latent factor.
Population
Participants from three representative German cohort studies in the GESA consortium
Comparison
Comparison between sexes and cohorts across somatic and cognitive-affective dimensions
Design
Multi-cohort study
Authors
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Supports PHQ-9 bidimensional scoring across sexes and cohorts; leaves generalizability and clinical utility open.
The PHQ-9 exhibits a bidimensional structure (somatic and cognitive-affective) that is measurement invariant across sex and regional German cohorts, supporting the assessment of these two distinct facets of depression.
Tibubos et al. (2021) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: