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

BMC Psychiatry

Table 1 Item mapping for confirmatory factor analysis

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

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]

ISSN: 1471-244X