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Table 1 Fit of the modified version of Postural Assessment Scale for Stroke Patients (SwePASS) to the Rasch model

From: Rasch analysis of the modified version of the Postural Assessment Scale for Stroke patients: Postural Stroke Study in Gothenburg (POSTGOT)

Analysis Item fit residual mean (SD) Person fit residual mean (SD) x2 DF P PSI % tests 95% CI
1. All items -0.41 (0.66) -0.16 (0.20) 34.78 24 0.07 0.97 3.33 -0.002-0.068
2. Rescoring -0.33 (0.51) -0.14 (0.18) 24.90 24 0.41 0.96 3.33 -0.002-0.068
3. Dealing with local dependency -0.33 (0.55) -0.14 (0.18) 22.79 22 0.41 0.96 2.5 0.025-0.095
Ideal values 0.00 (1.0) 0.00 (1.0)    >0.05* >0.90 <5.00 Lower bound <0.05
  1. SD; Standard Deviation, x2; Chi-square value, DF; Degrees of Freedom, P; P-value, PSI; Person Separation Index,% tests; percentage of positive t-test, 95% CI; 95% Confidence Interval, *; Bonferroni adjusted (Bonferroni correction p 0.004167 for all 12 items in analyses 1 and 2 and p 0.004545 for 10 items and the testlet in the analysis 3).