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Table 2 Psychometric properties at baseline and 1 year after primary hip joint replacement

From: Psychometric properties of the Brief Pain Inventory among patients with osteoarthritis undergoing total hip replacement surgery

   Baseline 1 year after surgery
  Number of items N % Floor 5 %Ceiling 6 Cronbach's α 7 N % Floor 5 %Ceiling 6 Cronbach's
α7
Brief Pain Inventory          
Pain severity index1 4 232 0 1 0.88 200 21 0 0.91
Function interference index2 7 234 0.4 1.3 0.87 191 24 0 0.95
WOMAC 3          
Pain 5 247 0.4 1.6 0.79 203 37 0 0.87
Stiffness 2 247 0.8 4.0 0.70 203 28 0 0.84
Physical function 17 248 0 0 0.93 202 9 0 0.96
SF-36 Scale 4          
Physical functioning 10 248 4 0 0.82 201 1 4 0.92
Role-physical 4 247 82 4 0.84 197 37 34 0.89
Bodily pain 2 250 6 0 0.68 200 0.5 27 0.87
General health 5 240 0.8 3 0.69 196 0 7 0.81
Vitality 4 242 3 0 0.82 199 0 4 0.86
Social functioning 2 250 4 18 0.82 202 0.5 56 0.89
Role-emotional 3 242 42 40 0.91 198 23 60 0.89
Mental health 5 240 0 7 0.85 198 0 12 0.78
  1. 1 Range 0 - 40 (no pain, pain as bad you can image)
  2. 2 Range 0 - 70 (does not interfere, interferes completely)
  3. 3 Range 0 - 10 (no problem, maximum problem)
  4. 4 Range 0 - 100 (poor health status, maximal health status)
  5. 5 % scoring worst possible value
  6. 6 % scoring best possible value
  7. 7 Internal consistency reliability