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Table 3 Item fit statistics for the PAM-13

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 calibration
(logits)
Infit
Mean squared
Outfit
Mean squared
1−1.521.211.13
2−1.501.581.97
4−1.071.271.16
6−0.750.800.75
3−0.750.950.89
7−0.550.951.04
5−0.400.850.80
80.110.740.70
131.141.121.44
91.170.910.95
101.190.960.97
121.230.960.96
111.680.931.29
  1. Note: Results in bold indicate values that are beyond the ideal cutoffs for infit and outfit statistics (i.e. Msq of 0.5–1.5)