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Table 1 Final fit statistics for each PIPP subscale

From: Measuring the impact and distress of osteoarthritis from the patients' perspective

Analysis No. items Item Fit
Residual
Person Fit Residual Chi-Square Interaction Person Separation PSI
   Mean SD Mean SD Chi-square (df) p  
Impact         
Self care 4 0.052 1.108 -0.398 1.103 9.305 (8) 0.317 0.932
Mobility 4 0.147 1.67 -0.378 .935 13.82(8) 0.086 0.92
Participation 4 0.285 0.510 -0.437 1.065 11.495 (8) 0.175 0.899
Relationships 4 0.004 1.156 -0.479 1.221 14.769(8) 0.064 0.955
Psychological 5 -0.164 0.388 -0.491 1.186 11.474(10) 0.32 0.900
Distress         
Self care 4 -0.205 1.15 -0.498 1.033 12.13(8) 0.145 0.92
Mobility 4 0.182 0.634 -0.366 0.982 13.381(8) 0.099 0.884
Participation 5 0.252 1.402 -0.507 1.255 20.755(10) 0.023 0.936
Relationships 4 0.037 1.059 -0.399 1.051 11.163(8) 0.193 0.956
Psychological 5 -0.106 0.320 -0.538 1.195 6.731(10) 0.751 0.918
Ideal Value   0.000 1.000 0.000 1.000   >0.05 >0.7