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Table 2 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 0.42635 0.86393 −0.00762 0.921403 0.352889 0.999999
Dizzy 0.83491 2.32417 −0.07812 0.583951 0.127721 0.999999
Backache 1.65534 0.45607 0.02796 0.095554 0.499631 0.999999
Nervous 0.1515 3.51789 0.00364 0.998015 0.061009 1.000000
Stomach-Boys 0.54165 0.844123
Stomach-Girls 0.76404 0.649901
Low-Boys 1.43163 0.171722
Low-Girls 2.53774 0.007511
Headache-Boys 0.32799 0.96567
Headache -Girls 0.16421 0.997245
Irritable-Boys 0.99948 0.439496
Irritable-Girls 1.63712 0.102044
  1. Item set with 4 items resolved for gender DIF. Adjusted sample size for test of fit (n = 960). Bonferroni adjusted significance level: 0.002500. No items showing significant DIF