BMC Geriatrics

Table 5 The results of DIF analysis with logistic regression

From: Item response analysis of the Geriatric Anxiety Inventory among the elderly in China: dimensionality and differential item functioning test

Item	Sex				Somatic Disease
Item	Statistic	p	R²	Effect size	Statistic	p	R²	Effect size
1	1.46	0.48	0.0015	A	3.66	0.16	0.0105	A
2	0.92	0.63	0.0009	A	5.56	0.06	0.0162	A
3	2.14	0.34	0.0026	A	1.94	0.38	0.0074	A
4	3.06	0.21	0.0034	A	3.92	0.14	0.0118	A
5	1.39	0.50	0.0018	A	0.15	0.93	0.0006	A
6	3.61	0.16	0.0030	A	6.60	0.04^a	0.0142	A
7	3.98	0.14	0.0038	A	0.76	0.69	0.0021	A
8	3.96	0.14	0.0030	A	5.98	0.05	0.0125	A
9	2.74	0.25	0.0020	A	3.05	0.22	0.0059	A
10	3.86	0.15	0.0039	A	2.44	0.30	0.0071	A
11	0.15	0.93	0.0001	A	5.32	0.07	0.0134	A
12	4.02	0.13	0.0045	A	8.97	0.01^a	0.0289	A
13	3.97	0.14	0.0040	A	6.00	0.04^a	0.0184	A
14	3.79	0.15	0.0056	A	3.10	0.21	0.0151	A
15	2.14	0.34	0.0037	A	0.50	0.78	0.0029	A
16	1.36	0.50	0.0018	A	4.61	0.10	0.0173	A
17	0.19	0.91	0.0004	A	0.22	0.90	0.0022	A
18	4.33	0.11	0.0080	A	1.68	0.43	0.0091	A
19	0.89	0.64	0.0014	A	1.13	0.57	0.0052	A
20	6.01	0.04^a	0.0062	A	2.12	0.35	0.0061	A

Note. ^aindicated significance at 0.05 level. The DIF estimates are classified according to effect size as “A” (negligible effect), “B” (moderate effect), and “C” (large effect”)

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