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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
  1. Values showing significant misfit bolded.
  2. Fit Residual df = 69, Chi-square df = 1
  3. SE = Standard error, Fit Resid = Fit Residual, Chi-Sq = Chi-Square, Prob = probability