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Table 1 Fit of the LW-CI-PD dimensions to the Rasch model (results for Acceptance, Coping and Integration dimensions are shown.after model modifications)

From: Rasch analysis of the living with chronic illness scale in Parkinson’s disease

  Ideal values Acceptance Coping Self-management Integration Adjustment to the disease
Number of items    3 6a 4 4 6
Item residual Mean 0 0.175 0.366 0.283 0.238 0.795
SD 1 1.011 1.248 1.358 1.203 1.149
Person residual Mean 0 −0.209 −0.565 0.972 0.748 0.249
SD 1 2.167 1.577 1.688 1.562 1.141
Chi-square Value   17.296 33.471 29.21 28.232 43.206
Prob. > 0.05/number of items 0.134 0.015 0.0006 0.0297 0.000146
PSI   > 0.70 0.798 0.765 0.67 0.728 0.663
Unidimensional test CI test Binomial   (LCI < 0.05) 0.0401
(0.016, 0.064)
0.0216
(−0.002, 0.045)
0.0185
(−0.005, 0.042)
0.0401 (0.016–0.64) 0.0154
(− 0.008, 0.039)
  1. SD Standard deviation, PSI Person separation index, Prob. probability, CI Confidence interval, LCI Lower confidence interval
  2. a Included two items 9, for younger and older adults Unidimensionality results before splitting item 9