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Table 1 Estimated responsiveness and minimal important differences (MID) for the SF-36 and the Harris Hip Score (HHS)§

From: Responsiveness and minimal important differences after revision total hip arthroplasty

      Indicators of responsiveness MID
  Before revision THA After revision THA Differences       
Subscale Mean (S.D.) Mean (S.D.) Mean (S.D.) P value PC (%) ES SRM RE  
SF-36          
   PF 64.1(6.7) 72.2(6.4) 8.1(6.5) <0.001 12.67 1.22 1.25 0.07 3.25
   RP 29.6(14.3) 41.3(7.2) 11.8(9.6) <0.001 39.77 0.82 1.23 0.10 4.78
   RE 59.0(36.2) 90.2(43.7) 31.2(40.0) <0.001 52.80 0.86 0.78 0.33 19.98
   SF 69.8(45.9) 88.2(47.2) 18.4(31.7) <0.001 26.30 0.40 0.58 0.21 15.83
   BP 73.7(22.5) 82.9(24.5) 9.2(29.8) <0.001 12.54 0.41 0.31 0.09 14.91
   VT 53.4(34.0) 76.2(36.0) 22.8(45.6) <0.001 42.71 0.67 0.50 0.21 22.81
   MH 69.4(21.4) 82.2(22.3) 12.9(24.7) <0.001 18.54 0.60 0.52 0.11 12.37
   GH 64.1(42.3) 78.5(48.2) 14.4(28.2) <0.001 22.46 0.34 0.51 0.12 14.12
HHS          
   Pain 34.1(10.4) 95.4(15.7) 61.4(6.9) <0.001 179.99 5.91 8.92 0.57 3.44
   Function 35.9(7.1) 89.1(9.4) 53.3(4.6) <0.001 148.48 7.49 11.67 0.49 2.28
   Deformity 50.0(11.7) 100.0(20.0) 50.0(22.5) <0.001 100.00 4.28 2.22 0.67 11.26
   Motion 50.0(10.1) 100.0(14.7) 50.0(35.7) <0.001 100.00 4.95 1.40 0.72 17.86
   Total scores 36.5(6.6) 93.0(17.8) 56.5(4.9) <0.001 154.79 8.57 11.58 1.00 2.44
  1. §PC = percentage of change; ES = effect size; SRM = standard responsiveness means; RE = relative efficiency; CL = 95% confidence interval at lower limit; CU = 95% confidence interval at upper limit; PF = physical functioning; RP = role limitations due to physical problems; RE = role limitations due to emotional problems; SF = social functioning; BP = bodily pain; VT = vitality; MH = mental health; GH = general health; Pain = pain function; Function = physical function; Deformity = deformity; Motion = range of motion.