Table 2.

Differential item functioning (DIF)

	G2 (df = 2)	Severity DIF	Discrimination DIF
Appetite/weight disturbance	0.9	0.12	0.12
Sleep disturbance	10.0a	0.20	−0.01
Psychomotor disturbance	10.4a	−0.28b	−0.40a
Fatigue	50.3b	0.17	−0.51a
Worthlessness/guilt	6.1c	−0.11	0.10
Concentration difficulty	0.2	−0.01	−0.08
Suicidal ideation	28.4b	−0.47b	−0.15

Differences between the groups on either parameter were evaluated using 1df tests. The p-values for the 1df tests were adjusted using the Benjamini-Hochberg procedure. Parameters that (i) represent a statistically significant difference between groups, and (ii) meet our criteria for clinical significance are bolded.

^ap < 0.01;

^bp < 0.001;

^cp < 0.05.