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Table 3 Risk factors for OA progression after RAO assessed by univariate and multivariate regression analyses

From: Ten-year survival rate after rotational acetabular osteotomy in adulthood hip dysplasia

Variables Hazard ratio 95% Confidence Interval p value
Univariate regression
 Preoperative
  Age at the time of surgery 1.051 1.011–1.093 0.013
  Body mass index 0.996 0.847–1.170 0.957
  Smoking history 0.555 0.213–1.451 0.230
  Presence of cysts 1.398 0.710–2.752 0.333
  Deformity of the femoral head 0.895 0.389–2.063 0.795
  Center edge angle (°) 0.998 0.962–1.035 0.911
  Sharp angle (°) 0.961 0.888–1.039 0.315
  Acetabular head index (%) 1.000 0.963–1.037 0.981
  Acetabular roof obliquity (°) 1.015 0.965–1.067 0.572
  Obturator foramen-head distance (mm) 1.074 0.970–1.188 0.169
  Joint space width (mm) 0.961 0.819–1.126 0.621
  Radiographic stage 1.028 0.664–1.592 0.902
 Immediately after the surgery
  Center edge angle (°) 0.996 0.971–1.023 0.783
  Sharp angle (°) 1.014 0.972–1.058 0.520
  Acetabular head index (%) 1.001 0.969–1.035 0.935
  Acetabular roof obliquity (°) 0.999 0.974–1.026 0.959
  Obturator foramen-head distance (mm) 0.925 0.855–1.001 0.052
  Joint space width (mm) 0.953 0.763–1.189 0.669
  Radiographic stage 0.808 0.459–1.425 0.462
  Joint congruity 0.997 0.680–1.460 0.986
  Thickness of the transferred acetabulum 0.887 0.800–0.982 0.022
Multivariate regression
 Age at the time of surgery 1.047 1.005–1.091 0.028
 Thickness of the transferred acetabulum 0.923 0.829–1.027 0.142
  1. N = 65 hips
  2. OA osteoarthritis, RAO rotational acetabular osteotomy