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Table 4 Comparison of Rasch derived PIPP subscale scores for low versus high numbers of pain sites

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

  1 to 4 sites 5 to 14 sites    
  N Median N Median Mann-Whitney U Z p
Impact        
Self-care 93 -3.39 93 -2.67 3442 -2.50 .012
Mobility 103 -1.36 98 -.25 3544 -3.65 .000
Relationship 93 -3.39 92 -2.28 3481 -2.30 .022
Participation 101 -.69 97 -.037 3318 -3.92 .000
Psychological 104 -1.04 98 -.25 3518 -3.80 .000
Distress        
Self-care 71 -3.13 84 -2.00 2436 -2.06 .039
Mobility 83 -1.00 89 -.30 2617 -3.30 .001
Relationship 71 -3.39 81 -2.51 2227 -2.51 .012
Participation 86 -1.12 86 -.22 2797 -2.76 .006
Psychological 87 -1.18 85 -.26 2444 -3.84 .000
  1. Median values are Rasch derived person estimates ranging from -4.2 to +9.1 with high positive scores indicating higher impact or distress.