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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
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Health and Quality of Life Outcomes

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