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Table 2 Model Fit of the USE-MS-G to the Rasch model

From: German translation, cultural adaptation and validation of the unidimensional self-efficacy scale for multiple sclerosis

Analysis Item residual Person residual (Cond.)a Chi-Squareb PSIc Alpha Unidimensionalityd
Mean SD Mean SD Value (df) p    % tests > 5% 95% CI
1) 12-item scale 0.05 2.19 −0.31 1.33 138.46 (48) 0.000 0.86 0.87 23.0 5–9.9
2) 2 super-items 0.15 0.88 −0.59 1.01 29.24 (22) 0.138 0.85 0.86 4.2 1.8–6.6
Ideal values 0.00 1.00 0.00 1.00   > 0.01* > 0.70 > 0.70 < 5.0 LCI < 5
  1. Abbreviations: T1/2 testlet, or super-item 1/2, Cond. conditional, df degrees of freedom, PSI person separation index, Alpha Cronbach’s alpha, SD standard deviation, CI confidence interval, LCI lower bound of the 95% CI
  2. aConditional Chi-Square: only applicable for the super-item solution; for the item-based solution, the Chi Square is shown
  3. bChi-Square of T1: 3392 (4), p = 0,494; Chi-Square of T2: 1054 (4), p = 0,901. Perfect values are > 0.004* (Bonferroni adjusted)
  4. cThe PSI indicates the reliability and differentiation of strata
  5. dBased on independent t-tests to compare person residuals which are positively and negatively loading on the first principal component
  6. *Bonferroni adjusted and variable with number of items