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Table 5 Summary of Item statistics for FAPSI-81

From: Brief assessment of priority symptoms in hormone refractory prostate cancer: The FACT Advanced Prostate Symptom Index (FAPSI)

FAPSI Item N Avg. Item Calibration (logits/s.e.) Infit statistic (mean square) Outfit Statistic (mean square)
Worry condition gets worse 271 0.93/0.05 1.13 1.15
Lack of energy 271 0.52/0.06 0.92 0.95
Bone pain 271 0.10/0.06 0.75 0.70
Difficulty urinating 270 -0.06/0.07 1.44 1.34
Urinating limits activities 271 -0.20/0.07 1.42 1.11
Pain 270 -0.24/0.07 0.77 0.67
Pain limits performance 267 -0.25/0.07 0.84 0.63
Weight loss 271 -0.84/0.10 1.36 1.28
  1. 1based on Andrich's (1978a, b) extension of the Rasch rating scale model