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Table 4 Item fit statistics for the PAM-13 following removal of items − 2

From: Is the Patient Activation Measure a valid measure of osteoarthritis self-management attitudes and capabilities? Results of a Rasch analysis

PAM items (in order of difficulty)Difficulty calibrationInfit
Mean squared
Outfit
Mean squared
1−1.731.401.56
4−1.251.321.19
6−0.920.830.78
3−0.921.040.99
7−0.721.001.11
5−0.550.880.84
8−0.020.750.7
131.071.141.42
91.100.900.93
101.130.950.95
121.170.970.97
111.650.921.23
  1. Note: Results in bold indicate values that are beyond the ideal cutoffs for infit and outfit statistics (ie. Msq of 0.5–1.5)