Table 5. Results of DIF analysis and GRM item parameters (N = 1,515).

	DIF (McFadden’s R2)			GRM item parameters
#	uniform	non-uniform	overall	a	b1	b2
1	0.014	0.000	0.014	2.42	0.71	2.37
2	0.000	0.000	0.000	1.66	-1.00	2.06
3	0.000	0.004	0.005	1.45	0.38	3.14
4	0.001	0.000	0.001	1.18	0.10	3.35
5	0.001	0.000	0.001	1.77	0.87	2.71
6	0.004	0.000	0.004	1.18	0.26	2.36
7	0.004	0.007	0.010	2.11	0.96	2.46
8	0.000	0.000	0.000	1.44	0.56	2.21
9	0.001	0.000	0.001	1.65	1.08	3.11
10	0.038	0.000	0.038	2.47 / 2.54	1.23 / 0.59	2.25 / 1.81
11	0.007	0.001	0.008	1.17	0.40	3.27
12	0.025	0.004	0.029	1.43 / 1.07	0.86 / 1.77	2.34 / 4.44
13	0.002	0.000	0.002	1.19	-0.12	2.65
14	0.002	0.000	0.003	1.16	-0.53	2.31
15	0.010	0.000	0.010	0.76	-0.40	2.40
16	0.000	0.000	0.000	1.36	0.87	2.62
17	0.001	0.000	0.001	1.02	-0.06	2.59
18	0.000	0.001	0.001	0.80	1.14	2.92
19	0.011	0.000	0.012	1.41	-0.16	2.23
20	0.000	0.000	0.000	1.95	0.70	2.33
21	0.009	0.000	0.009	0.98	1.74	4.54
22	0.001	0.010	0.011	0.94	1.00	4.92
23	0.007	0.000	0.007	1.16	0.14	2.75
24	0.001	0.000	0.001	1.07	-0.99	1.77
25	0.016	0.002	0.018	1.16	1.04	3.59
26	0.001	0.000	0.001	0.78	1.54	4.92
27	0.020	0.001	0.021	1.54 / 1.34	0.93 / 1.56	2.62 / 3.78

Note. R² values exceeding the 0.020 threshold are in bold; a–item discrimination; b1, b2 –item threshold parameters; in case of DIF (R² > 0.020), GRM item parameters were estimated separately (boys / girls).