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Table 3 Goodness of fit to the Rasch model for each dimension (factor)

From: Developing a dementia-specific health state classification system for a new preference-based instrument AD-5D

Dimensions χ2 (df) p-value Item fit (SD) Person fit (SD) PSI
Interpersonal environment 37.9 (36) 0.830 0.064 (1.004) −0.708 (1.590) 0.577
Physical health 10.9 (10) 0.358 0.666 (0.130) −0.405 (0.749) 0.128
Self-functioning 4.1 (10) 0.941 0.015 (0.020) −1.032 (1.310) 0.443
  1. Abbreviations: SD standard deviation, PSI person separation index