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Table 2 The 30 items and their Rasch measurement properties by location order

From: Psychometric evaluation of the Disabilities of the Arm, Shoulder and Hand (DASH) with Dupuytren’s contracture: validity evidence using Rasch modeling

      Chi-square F-stat
  Items Location SE Fit Residual Value p-value Value p-value
3. Turn a key -1.37 0.18 -1.149 3.953 0.139 2.833 0.062
20. Manage transportation needs -1.279 0.166 -0.475 1.932 0.381 0.864 0.424
15. Put on a pullover sweater -1.27 0.144 -1.57 4.864 0.088 2.902 0.058
4. Prepare a meal -1.219 0.154 -1.863 3.585 0.167 2.335 0.101
9. Make a bed* -1.13 0.143 -2.106 7.508 0.023 6.288 0.002
2. Write -1.051 0.162 0.177 1.805 0.406 0.658 0.519
29. Difficulty sleeping -1.017 0.137 0.365 0.067 0.967 0.066 0.936
10. Carry a shopping bag or briefcase -0.857 0.127 -1.072 2.319 0.314 1.049 0.353
26. Tingling* -0.817 0.134 2.186 8.396 0.015 2.299 0.104
22. Interference with normal social activities -0.808 0.139 1.213 4.652 0.098 1.024 0.362
8. Garden or do yard work* -0.701 0.13 -2.199 6.767 0.034 4.432 0.014
23. Limitation in work or other regular daily activities -0.657 0.13 -0.221 3.192 0.203 1.406 0.249
27. Weakness -0.495 0.124 -0.073 3.467 0.177 1.319 0.271
24. Pain in arm, shoulder or hand -0.434 0.127 1.662 2.928 0.231 1.191 0.307
25. Pain when performing specific activity -0.423 0.121 -0.097 0.791 0.673 0.417 0.660
5. Push open a heavy door 0.197 0.135 -1.156 3.168 0.205 1.933 0.148
16. Use a knife to cut food 0.252 0.142 -0.176 0.794 0.672 0.22 0.803
13. Wash or blow dry hair 0.375 0.126 -0.996 0.306 0.858 0.182 0.833
17. Recreational activities which require little effort 0.376 0.141 -0.364 2.547 0.280 1.861 0.159
6. Place an object on a shelf above head 0.647 0.127 -1.047 0.578 0.749 0.287 0.751
7. Do heavy household chores* 0.813 0.119 -2.302 7.891 0.019 5.143 0.007
14. Wash your back 0.923 0.112 -0.559 0.837 0.658 0.34 0.712
21. Sexual activities* 0.923 0.127 1.937 16.732 0.000 2.796 0.065
12. Change a lightbulb overhead 0.944 0.118 -0.384 3.054 0.217 1.355 0.261
11. Carry a heavy object (over 10 lbs) 1.094 0.11 -0.171 0.697 0.706 0.475 0.623
19. Recreational activities which move arm freely 1.132 0.111 -0.867 1.026 0.599 0.741 0.478
28. Stiffness* 1.223 0.109 3.315 11.746 0.003 4.221 0.017
18. Recreational activities with force or impact 1.277 0.111 -0.14 0.718 0.698 0.246 0.782
1. Open a tight or new jar 1.639 0.111 0.37 0.582 0.747 0.165 0.848
30. Feeling less capable, less confident or less useful* 1.714 0.098 2.937 13.022 0.001 2.839 0.062
  1. Positive location (measure) numbers mean harder items; negative location means easier items.
  2. Abbreviation: SE, standard error.
  3. Bolded items: outside the ±2.5 range for fit residuals.
  4. *fit residuals with significant chi-square and\or F-statistics (p <0.05).