Table 1.
Fit of the modified version of Postural Assessment Scale for Stroke Patients (SwePASS) to the Rasch model
| Analysis | Item fit residual mean (SD) | Person fit residual mean (SD) | x 2 | 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 |
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).