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Table 5 Responsiveness indices (Effect Size (ES), Standardized Response Mean (SRM) and Responsiveness Index (RI)), for change from baseline to 1 year after hip joint replacement surgery, according to perceived global change.

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

  Improved (n = 133) Unchanged or worsened (n = 28)
  ES SRM RI ES SRM RI
Brief Pain Inventory       
Pain severity index1 1.70 1.71 2.17 1.00 1.36 1.39
Function interference index2 1.80 1.56 2.16 1.27 1.40 1.56
WOMAC 3       
Pain -2.98 -2.82 -3.01 -1.61 -1.84 -2.07
Stiffness -2.46 -1.90 -1.76 -1.56 -1.25 -1.33
Physical function -2.96 -2.75 -2.53 -1.35 -1.53 -1.50
SF-36 Scale 4       
Physical functioning 2.36 1.68 2.01 1.35 1.53 1.50
Role-physical 1.50 1.02 1.01 1.26 1.19 1.10
Bodily pain 2.87 1.95 1.80 2.16 1.31 1.17
General health 0.37 0.40 0.43 -0.36 -0.41 -0.42
Vitality 0.85 0.88 1.19 0.46 0.58 0.66
Social functioning 0.93 0.97 0.84 0.40 0.50 0.46
Role-emotional 0.54 0.60 0.40 0.23 0.19 0.18
Mental health 0.51 0.69 0.59 0.01 0.01 0.01
  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)