Table 3.

Factor loadings derived from EFA for the PHQ-8 and the PHQ-9

	PHQ-8	PHQ-9
Items	Factor's loadinga	Factor's loadinga
Depressed mood (item 1)	0.81	0.73
Anhedonia (item 2)	0.79	0.77
Sleep problems (item 3)	0.46	0.51
Feelings of tiredness (item 4)	0.68	0.64
Changes in appetite (item 5)	0.58	0.47
Feelings of guilt or worthlessness (item 6)	0.74	0.69
Difficult to focus (item 7)	0.64	0.65
Feelings of slowness or concern (item 8)	0.57	0.51
Suicidal ideation (item 9)	–	0.55

^aBased on parallel analysis.