From: A Rasch Analysis of the Manchester Foot Pain and Disability Index
Item | Differential item functioning: gender | Differential item functioning: age group | ||
---|---|---|---|---|
 | Uniforma | Non-uniformb | Uniforma | Non-uniformb |
Functioning | Â | Â | Â | Â |
1. Avoid walking outside | 0.2073 | 0.6787 | 0.7507 | 0.0786 |
2. Avoid walking long distances | 0.2544 | 0.8759 | 0.7729 | 0.3730 |
3. Don't walk in a normal way | 0.9714 | 0.0968 | 0.0895 | 0.9878 |
4. Walk slowly | 0.0161 | 0.3659 | 0.6014 | 0.3262 |
5. Have to stop and rest feet | 0.1247 | 0.5087 | 0.7701 | 0.3262 |
6. Avoid hard or rough surfaces | 0.0673 | 0.4546 | 0.0014* | 0.9992 |
7. Avoid standing for a long time | 0.5544 | 0.8868 | 0.6841 | 0.1632 |
8. Catch the bus or use the car more often | 0.4011 | 0.0614 | 0.9277 | 0.2543 |
9. Need help with housework or shopping | 0.9402 | 0.9359 | 0.1205 | 0.8793 |
11. Get irritable when feet hurt | 0.5657 | 0.2936 | 0.4229 | 0.9999 |
Pain | Â | Â | Â | Â |
10. Do everything with more pain or discomfort | 0.1000 | 0.3845 | 0.6579 | 0.3527 |
14. Constant pain in feet | 0.6385 | 0.0736 | 0.6426 | 0.5198 |
15. Feet are worse in the morning | 0.4947 | 0.9999 | 0.1955 | 0.1860 |
16. Feet more painful in the evening | 0.0878 | 0.7780 | 0.5688 | 0.8217 |
17. Get shooting pains in feet | 0.4986 | 0.7282 | 0.6482 | 0.8619 |