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Table 1 Analysis of variance of residuals for test of DIF between genders as well as tests of class interval fit based on data from 1985 to 2014; number of class intervals = 10

From: Recent advances in analysis of differential item functioning in health research using the Rasch model

   F-values Probability values
Item label Class interval Gender Gender by class interval Class interval Gender Gender by class interval
Sleeping difficulties 0.70234 16.30693 −0.31603 0.707171 0.000043 0.999999
Dizzy 0.71354 1.18359 0.47319 0.679772 0.276895 0.875555
Headache 0.55131 10.15275 −0.06779 0.837156 0.001488 0.999999
Stomach ache 1.82150 39.77340 −0.89707 0.060650 0.000000 0.999999
Backache 1.86562 10.77054 −0.49054 0.053570 0.001070 0.999999
Feeling low 4.57403 33.15276 −1.50452 0.000012 0.000000 0.999999
Irritable/Bad temper 2.54980 0.04370 0.22978 0.006781 0.834472 0.990252
Nervous 0.13520 0.97861 0.05255 0.997656 0.322801 0.999930
  1. Original set of 8 items. Adjusted sample size for test of fit (n = 960). Bonferroni adjusted significance level: 0.002083. Items showing significant p-values marked in italics