Annals of General Psychiatry

Table 3 DIF for gender (p- value & Effect size)

From: Analyzing the psychometric properties of the PHQ-9 using item response theory in a Chinese adolescent population

	p-value				Effect Size
	α	β₁	β₂	β₃	α	β₁	β₂	β₃
Item 1	0.058	0.003	0.461	0.546	0.033	0.242	0.222	0.315
Item 2	0.182	0.000	0.000	0.000	0.021	0.419	0.344	0.329
Item 3	0.912	0.000	0.000	0.000	0.002	0.318	0.294	0.458
Item 4	0.663	0.000	0.002	0.054	0.007	0.286	0.268	0.252
Item 5	0.625	0.000	0.007	0.032	0.010	0.246	0.273	0.299
Item 6	0.072	0.000	0.000	0.000	0.033	0.479	0.477	0.556
Item 7	0.847	0.002	0.012	0.025	0.005	0.174	0.177	0.210
Item 8	0.257	0.017	0.122	0.188	0.025	0.234	0.258	0.319
Item 9	0.155	0.000	0.005	0.326	0.032	0.394	0.437	0.361

where bolded data indicate item parameters with significant differences in effect sizes

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ISSN: 1744-859X

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