Item performance across native language groups on the Iranian National University Entrance English Exam: a nationwide study

Language Testing in Asia

Table 14 Results of uniform DIF analysis of items (IUUESEE 2019)

Item	Class A	DIF	DIF SE	Class B	DIF	DIF SE	DIF Contrast	Welch t	df	p
5	Luri	−2.29	0.17	Persian	−1.79	0.08	−0.50	−2.72	404	0.0068
15	Luri	0.11	0.17	Persian	−0.33	0.08	0.45	2.37	235	0.0186
16	Luri	−0.28	0.15	Persian	0.16	0.08	−0.44	−2.54	304	0.0116
19	Luri	0.80	0.18	Persian	1.53	0.10	−0.73	−3.60	328	0.0004
22	Luri	0.34	0.32	Persian	1.03	0.13	−0.69	−1.97	75	0.0523
25	Luri	0.18	0.23	Persian	0.72	0.12	−0.54	−2.09	147	0.0386
40	Luri	−0.22	0.15	Persian	−0.86	0.07	0.64	3.77	295	0.0002
44	Luri	0.01	0.19	Persian	−0.09	0.09	0.10	0.49	209	0.6268
45	Luri	1.09	0.29	Persian	1.57	0.13	−0.48	−1.52	133	0.1301
55	Luri	1.06	0.28	Persian	1.31	0.12	−0.25	−0.83	128	0.4077
66	Luri	0.92	0.32	Persian	−0.17	0.13	1.08	3.14	101	0.0022
70	Luri	0.02	0.36	Persian	1.19	0.19	−1.17	−2.86	65	0.0056