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Table 4 Items with DIF across boys and girls

From: Evaluation of psychometric properties and differential item functioning of 8-item Child Perceptions Questionnaires using item response theory

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
   (χ2 = 0.4, df = 1, p = 0.540) (χ2 = 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
   (χ2 < 0.1, df = 1, p = 0.943) (χ2 = 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
   (χ2 = 1.5, df = 1, p = 0.483) (χ2 = 11.5, df = 3, p = 0.009)