Psychometric evaluation of a short-form version of the Swedish “Attitudes to and Knowledge of Oral Health” questionnaire

Table 2 Psychometric properties of the remaining items in the revised AKO

Item	Analyses from classical test theory		Analyses from Rasch
	Factor loading^a	Item-total correlation	Infit MnSq	Outfit MnSq	Discrimination	Difficulty	DIF contrast across gender^bc
Item 1	0.543	0.226	1.24	1.14	0.83	-1.68	0.16
Item 3	0.512	0.396	0.77	0.78	1.19	0.84	-0.06
Item 4	0.317	0.214	0.96	1.00	0.97	0.84	-0.09
Item 5	0.551	0.448	1.43	1.42	0.54	-0.41	0.08
Item 6	0.793	0.668	0.70	0.70	1.35	-0.10	-0.16
Item 7	0.756	0.618	0.79	0.80	1.23	0.350	0.37
Item 9	0.617	0.502	1.08	1.08	0.90	0.01	-0.27
Item 11	0.601	0.556	1.22	1.37	0.73	-0.52	0.05
Item 12	0.703	0.665	0.96	0.95	1.07	-0.27	-0.07
Item 13	0.697	0.640	1.21	1.24	0.77	0.60	0.43
Item 14	0.794	0.726	0.84	0.83	1.18	-0.29	-0.05
Item 15	0.757	0.705	0.93	0.94	1.09	0.20	-0.15
Item 16	0.791	0.732	0.80	0.80	1.20	0.27	-0.35

ISSN: 1471-2318