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Table 1 Item mapping for confirmatory factor analysis

From: The factor structure of major depressive symptoms in a sample of Chinese earthquake survivors

PHQ-9 Items Model 1 Model 2a Model 2b Model 2c Model 2d
Anhedonia Depression Non-somatic Non-somatic Non-somatic Somatic
Depressed mood Depression Non-somatic Non-somatic Non-somatic Non-somatic
Sleep difficulties Depression Somatic Somatic Somatic Somatic
Fatigue Depression Somatic Somatic Somatic Somatic
Appetite changed Depression Somatic Somatic Somatic Somatic
Feeling of worthless Depression Non-somatic Non-somatic Non-somatic Non-somatic
Concentration difficulties Depression Non-somatic Non-somatic Somatic Somatic
Psychomotor agitations/retardation Depression Non-somatic Somatic Somatic Somatic
Thoughts of death Depression Non-somatic Non-somatic Non-somatic Non-somatic
  1. Model 1 posits that a single one-dimension factor underlies the PHQ-9; Model 2a: Krause et al. [15], Krause et al. [25], Chilcot et al. [26]; Model 2b: de jonge et al. [16]; Model 2c: Krause et al. [25], Richardson & Richards, [27], Elhai et al. [17], Petersen et al. [28], Mordeno et al. [29], Guo et al. [31], Miranda & Scoppetta [32]. Model 2d: Krause et al. [25]
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