Table 1.
Fit of "Body Functions" item bank to Rasch model (after rescoring) (n = 266)
| Item | Location | SE | Individual Item Fit Residual | Chi-Square Test Statistics | p |
| WHODAS II – 1.1. In the last 30 days, how much difficulty did you have in concentrating on doing something for ten minutes? | 1.518 | 0.140 | 0.879 | 8.326 | 0.040 |
| WHODAS II – 1.3. In the last 30 days, how much difficulty did you have in analyzing and finding solutions to problems in day to day life? | 3.084 | 0.151 | 0.042 | 0.498 | 0.919 |
| WHODAS II – 1.5. In the last 30 days, how much difficulty did you have in generally understanding what people say? | 2.245 | 0.153 | -0.067 | 1.549 | 0.671 |
| WHODAS II – 1.6. In the last 30 days, how much difficulty did you have in starting and maintaining a conversation? | 3.521 | 0.166 | -0.147 | 0.985 | 0.805 |
| WHODAS II – 4.1. In the last 30 days, how much difficulty did you have in dealing with people you do not know? | 3.878 | 0.196 | 0.383 | 3.269 | 0.352 |
| WHODAS II – 4.2. In the last 30 days, how much difficulty did you have in maintaining a friendship? | 4.110 | 0.221 | -0.495 | 7.708 | 0.052 |
| WHODAS II – 4.3. In the last 30 days, how much difficulty did you have in getting along with people who are close to you? | 3.084 | 0.185 | -1.006 | 1.652 | 0.648 |
| WHODAS II – 4.4. In the last 30 days, how much difficulty did you have in making new friends? | 3.953 | 0.208 | 0.021 | 2.977 | 0.395 |
| WHODAS II – 6.3. In the last 30 days, how much of a problem did you have living with dignity because of the attitudes and actions of others? | 2.264 | 0.162 | 0.725 | 1.592 | 0.661 |
| WHODAS II – 6.5. In the last 30 days, how much have you been emotionally affected by your health condition? | 0.317 | 0.159 | -0.237 | 2.529 | 0.470 |
| RDQ 13. My back is painful almost all of the time | -2.956 | 0.179 | -0.266 | 3.331 | 0.343 |
| RDQ 18. I sleep less well because of my back | -1.661 | 0.152 | 0.655 | 1.915 | 0.590 |
| RDQ 22. Because of back pain, I am more irritable and bad tempered with people than usual | -2.762 | 0.173 | -1.237 | 1.950 | 0.583 |
| NHP 1. I'm tired all the time | -3.530 | 0.203 | -0.454 | 1.845 | 0.605 |
| NHP 2. I have pain at night | -2.146 | 0.159 | 0.671 | 3.030 | 0.387 |
| NHP 4. I have unbearable pain | 0.093 | 0.159 | 1.423 | 3.156 | 0.368 |
| NHP 6. I've forgotten what it's like to enjoy myself | -0.859 | 0.150 | -0.427 | 3.987 | 0.263 |
| NHP 7. I'm feeling on edge | -1.948 | 0.156 | -2.143 | 8.312 | 0.040 |
| NHP 9. I feel lonely | -0.680 | 0.151 | -1.264 | 6.513 | 0.089 |
| NHP 13. I'm waking up in the early hours of the morning | -2.018 | 0.157 | 1.478 | 11.751 | 0.008 |
| NHP 15. I'm finding it hard to make contact with people | 1.062 | 0.180 | -1.854 | 8.311 | 0.040 |
| NHP 16. The days seem to drag | -0.427 | 0.153 | -2.530 | 9.019 | 0.029 |
| NHP 20. I lose my temper easily these days | -2.018 | 0.157 | -0.733 | 0.632 | 0.889 |
| NHP 21. I feel there is nobody that I am close to | -0.512 | 0.152 | -1.411 | 8.458 | 0.037 |
| NHP 22. I lie awake for most of the night | -1.129 | 0.150 | -1.092 | 5.465 | 0.141 |
| NHP 23. I feel as if I'm losing control | -0.904 | 0.150 | -1.229 | 0.889 | 0.828 |
| NHP 28. I'm in constant pain | -2.208 | 0.160 | -0.693 | 3.152 | 0.369 |
| NHP 29. It takes me a long time to get to sleep | -1.590 | 0.152 | -0.154 | 6.140 | 0.105 |
| NHP 30. I feel I am a burden to people | -0.420 | 0.153 | -0.630 | 0.055 | 0.997 |
| NHP 31. Worry is keeping me awake at night | -1.200 | 0.150 | -2.118 | 5.686 | 0.128 |
| NHP 32. I feel that life is not worth living | 0.189 | 0.160 | -0.895 | 1.724 | 0.632 |
| NHP 34. I'm finding it hard to get along with people | 1.249 | 0.186 | -0.187 | 3.736 | 0.291 |
| NHP 37. I wake up feeling depressed | -1.601 | 0.152 | -1.579 | 2.496 | 0.476 |
WHODAS II: World Health Organization Disability Assessment Schedule II, RDQ: Roland Morris Low Back Pain Disability Questionnaire, NHP: Nottingham Health Profile, SE: Standard Error