Table 3 Individual item fit statistics for the nine-item MSIS-29-PSYCH
From: Rasch analysis of the Multiple Sclerosis Impact Scale (MSIS-29)
Item | MSIS Item name | Location | SE | Fit Resid | Chi Sq | Prob |
|---|---|---|---|---|---|---|
21 | Feeling unwell | 0.077 | 0.127 | 0.434 | 0.866 | 0.352 |
22 | Problems sleeping | -0.068 | 0.120 | 3.297 | 5.738 | 0.017 |
23 | Feeling mentally fatigued | -0.346 | 0.137 | -0.342 | 0.834 | 0.361 |
24 | Worries related to your MS | -0.348 | 0.124 | -0.110 | 1.199 | 0.273 |
25 | Feeling anxious or tense | -0.191 | 0.134 | -0.768 | 1.299 | 0.254 |
26 | Feeling irritable, impatient, or short tempered | -0.206 | 0.141 | 0.452 | 0.096 | 0.757 |
27 | Problems concentrating | -0.059 | 0.141 | -1.217 | 2.563 | 0.109 |
28 | Lack of confidence | 0.903 | 0.141 | -0.428 | 2.167 | 0.141 |
29 | Feeling depressed | 0.238 | 0.136 | -0.424 | 0.028 | 0.866 |