From: Rasch analysis of the patient-rated wrist evaluation questionnaire
Analysis | Item fits residual | Person Fit residual | Item-trait interaction | Unidimensionality | PSIa | |||
---|---|---|---|---|---|---|---|---|
Mean | SD | Mean | SDa | Chi-square (df)a | P | Per C < 5%a | ||
PAIN SUBSCALE | ||||||||
Initial | −0.41 | 1.72 | −0.45 | 0.94 | 23 (20) | 0.49 | 6.9% | 0.89 |
Final | −0.53 | 1.17 | −0.44 | 0.91 | 18 (20) | 0.54 | 2.5% | 0.84 |
SPECIFIC ACTIVITIES SUBSCALE | ||||||||
Initial | −0.60 | 2.13 | −0.45 | 1.07 | 54 (30) | 0.00 | 4.7% | 0.81 |
Final | −0.47 | 1.87 | −0.37 | 1.03 | 32 (25) | 0.04 | - (since items were split for DIF) | 0.80 |
USUAL ACTIVITIES SUBSCALE | ||||||||
Initial | −0.41 | 1.72 | −0.45 | 0.94 | 23 (20) | 0.28 | 1.5% | 0.78 |
Final | −0.43 | 1.58 | −0.45 | 1.00 | 35 (25) | 0.07 | - (since items were split for DIF) | 0.81 |