Table 4.

Items with DIF across boys and girls

Item	Gender	a	b1	b2	b3
Bad breath	Boys	0.63	−3.01	−1.05	3.14
(in both RSF:8 and ISF:8)	Girls	0.52	−2.50	−0.04	5.38
		(χ 2 = 0.4, df = 1, p = 0.540)	(χ 2 = 19.0, df = 3, p < 0.001)
Food caught between/in teeth	Boys	0.65	−5.00	−2.95	1.99
(in ISF:8)	Girls	0.67	−5.16	−2.27	2.93
		(χ 2 < 0.1, df = 1, p = 0.943)	(χ 2 = 12.6, df = 3, p = 0.006)
Concerned with other people think	Boys	1.37	−0.06	1.02	2.58
(in RSF:8)	Girls	1.57	−0.45	0.85	2.69
		(χ 2 = 1.5, df = 1, p = 0.483)	(χ 2 = 11.5, df = 3, p = 0.009)