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Table 1 Summary of Rasch analyses for the PCCS and CSCS with DIF according to Gender (Gen), Age, Experience (Exp), Entry qualification (Ent) and Occasion of Administration (Occ)

From: Development and psychometric evaluation of scales to measure professional confidence in manual medicine: a Rasch measurement approach

Scale Disorder-ed items Significant residual correlations (>0.3) Misfitting items DIF PSI*
Gen Age Exp Ent Occ
PCCS none 18 pairs 20, 16 none none none none none 0.962
CSCS 12, 27 20 pairs 1, 13 none none none none none 0.933
  1. *Person Separation Index.