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Table 2 Fit of "activity-participation" item bank to Rasch model (after rescoring) (n = 266)

From: An initial application of computerized adaptive testing (CAT) for measuring disability in patients with low back pain

Item Location SE Individual Item Fit Residual Chi-Square Test Statistics p
WHODAS II – 2.1. In the last 30 days, how much difficulty did you have in standing for long periods such as 30 minutes? 0.132 0.116 2.141 6.255 0.100
WHODAS II – 2.2. In the last 30 days, how much difficulty did you have in standing up from sitting down? 1.846 0.152 -1.500 2.695 0.441
WHODAS II – 2.3. In the last 30 days, how much difficulty did you have in moving around inside your home? 2.752 0.146 -0.579 3.289 0.349
WHODAS II – 2.4. In the last 30 days, how much difficulty did you have in getting out of your home? 1.907 0.162 -1.600 5.242 0.155
WHODAS II – 2.5. In the last 30 days, how much difficulty did you have in walking a long distance such as a kilometer (or equivalent)? 0.110 0.114 -0.115 1.716 0.633
WHODAS II – 3.1. In the last 30 days, how much difficulty did you have in washing your whole body? 4.182 0.149 -0.844 2.264 0.519
WHODAS II – 3.2. In the last 30 days, how much difficulty did you have in getting dressed? 4.376 0.145 -0.638 1.780 0.619
WHODAS II – 3.3. In the last 30 days, how much difficulty did you have in eating? 4.163 0.156 1.320 0.275 0.965
WHODAS II – 3.4. In the last 30 days, how much difficulty did you have in staying by yourself for a few days? 2.540 0.130 2.009 7.187 0.066
WHODAS II – 5.3. In the last 30 days, how much difficulty did you have in doing most important households tasks well? 1.882 0.146 -1.405 4.658 0.199
WHODAS II – 5.4. In the last 30 days, how much difficulty did you have in getting all the household work done that you needed to do? -0.038 0.115 -0.758 5.290 0.152
WHODAS II – 5.5. In the last 30 days, how much difficulty did you have in getting your household work done as quickly as needed? -0.144 0.120 -0.608 2.190 0.534
WHODAS II – 6.1. In the last 30 days, how much of a problem did you have in joining in community activities (for example, festivities, religious or other activities) in the same way as anyone else can 1.911 0.119 0.471 0.456 0.928
WHODAS II – 6.2. In the last 30 days, how much of a problem did you have because of barriers or hindrances in the world around you? 3.722 0.142 1.391 6.266 0.099
WHODAS II – 6.8. In the last 30 days, how much of a problem did you have in doing things by yourself for relaxation or pleasure? 2.115 0.141 -0.986 0.793 0.851
ODI 4. Walking 3.082 0.106 0.361 7.119 0.068
ODI 6. Standing 0.651 0.104 0.447 4.730 0.193
ODI 9. Social Life 1.578 0.102 1.585 11.801 0.008
ODI 10. Travelling 0.216 0.137 -1.365 1.964 0.580
RDQ 1. I stay at home most of the time because of my back -0.396 0.156 -0.836 2.526 0.471
RDQ 2. I change position frequently to try to get my back comfortable -2.904 0.274 -0.207 2.106 0.551
RDQ 3. I walk more slowly than usual because of my back -1.705 0.198 -1.807 9.433 0.024
RDQ 4. Because of my back, I am not doing any jobs that I usually do around the house -1.064 0.173 -0.307 2.586 0.460
RDQ 5. Because of my back, I use handrail to get upstairs -1.862 0.205 -1.482 4.863 0.182
RDQ 6. Because of my back, I lie down to rest more often -1.745 0.200 -0.001 1.760 0.624
RDQ 7. Because of my back, I have to hold on to something to get out of an easy chair -0.482 0.158 0.522 2.695 0.441
RDQ 8. Because of my back, I try to get other people to do things for me -0.252 0.153 1.712 8.550 0.036
RDQ 9. I get dressed more slowly than usual because of my back -0.522 0.159 -0.079 1.594 0.661
RDQ 10. I only stand up for short periods of time because of my back -2.219 0.225 -1.558 4.238 0.237
RDQ 11. Because of my back, I try not to bend or kneel down -3.023 0.284 -0.823 2.227 0.527
RDQ 12. I find it difficult to get out of chair because of my back -0.647 0.162 -0.527 3.033 0.387
RDQ 14. I find it difficult to turn over in bed because of my back -1.157 0.177 -1.006 4.851 0.183
RDQ 16. I have trouble putting on my sock (or stockings) because of the pain in my back -0.753 0.164 -0.316 2.821 0.420
RDQ 17. I can only walk short distances because of my back pain -0.745 0.164 -2.068 8.215 0.042
RDQ 19. Because of my back pain, I get dressed with the help of someone else 3.879 0.253 -0.611 4.508 0.212
RDQ 21. I avoid heavy jobs around the house because of my back -1.734 0.199 0.091 1.217 0.749
RDQ 23. Because of my back, I go upstairs more slowly than usual -2.556 0.247 -1.294 3.386 0.336
RDQ 24. I stay in bed most of the time because of my back 1.959 0.157 0.786 7.979 0.046
NHP 8. I find it painful to change position -1.594 0.193 -0.478 5.599 0.133
NHP 11. I find it hard to bend -1.954 0.210 -1.284 2.197 0.533
NHP 12. Everything is an effort -0.805 0.166 -1.470 7.025 0.071
NHP 18. I find it hard to reach for things -2.090 0.217 -1.710 3.055 0.383
NHP 19. I'm in pain when I walk -1.740 0.200 -1.263 3.802 0.284
NHP 24. I'm in pain when I'm standing -2.701 0.257 -0.611 0.774 0.856
NHP 25. I find it hard to get dressed by myself 1.174 0.146 1.298 2.948 0.400
NHP 26. I soon run out of energy -2.134 0.220 5.455 1.989 0.575
NHP 27. I find it hard to stand for long (e.g., at the kitchen sink, waiting in a line) -3.334 0.314 -1.092 1.178 0.758
NHP 36. I'm in pain when going up or down stairs -2.459 0.240 -1.310 5.191 0.158
NHP 38. I'm in pain when I'm sitting -1.417 0.186 1.374 2.394 0.495
  1. WHODAS II: World Health Organization Disability Assessment Schedule II, ODI: Oswestry Disability Index, RDQ: Roland Morris Low Back Pain Disability Questionnaire, NHP: Nottingham Health Profile, SE: Standard Error