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Table 2 Individual item fit statistics for the 20-item MSIS-29-PHYS

From: Rasch analysis of the Multiple Sclerosis Impact Scale (MSIS-29)

Item MSIS Item name Location SE Fit Resid Chi Sq Prob
1 Do physically demanding tasks -2.239 0.254 0.382 0.632 0.427
2 Grip things tightly (e.g. turning on taps) 0.219 0.201 0.453 1.509 0.219
3 Carry things -0.788 0.235 0.361 0.138 0.710
4 Problems with your balance -0.481 0.279 0.747 0.259 0.611
5 Difficulties moving about indoors 1.682 0.256 0.294 0.156 0.693
6 Being clumsy 0.061 0.278 -1.097 2.381 0.123
7 Stiffness 0.009 0.233 -0.200 0.424 0.515
8 Heavy arms and/or legs -0.258 0.218 -0.758 0.089 0.765
9 Tremor of your arms or legs 0.696 0.213 1.356 1.091 0.296
10 Spasms in your limbs 0.723 0.222 0.574 0.375 0.540
11 Your body not doing what you want it to do -0.577 0.204 -0.669 0.115 0.734
12 Having to depend on others to do things for you -0.102 0.219 -1.681 2.116 0.146
13 Limitations in your social and leisure activities at home 0.515 0.234 -0.938 4.469 0.035
14 Being stuck at home more than you would like to be 0.022 0.196 -0.721 0.148 0.701
15 Difficulties using your hands in everyday tasks 0.669 0.219 -0.268 0.384 0.536
16 Having to cut down the amount of time you spent on work or other daily activities -0.096 0.215 -0.702 0.033 0.855
17 Problems using transport (e.g. car, bus, train, taxi, etc.) 0.639 0.199 -0.916 0.258 0.611
18 Taking longer to do things -0.200 0.239 -0.884 0.086 0.770
19 Difficulty doing things spontaneously (e.g. going out on the spur of the moment) -0.075 0.206 -1.117 0.025 0.875
20 Needing to go to the toilet urgently -0.419 0.196 3.715 4.649 0.031
  1. Values showing significant misfit bolded.
  2. SE = Standard error, Fit Resid = Fit Residual, Chi-Sq = Chi-Square, Prob = probability
  3. Fit Residual df = 82.6, Chi-square df = 1