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Table 3 Association between CHKA and CHFA according to baseline characteristics

From: Association between changes in hip-knee-ankle angle and hindfoot alignment after total knee arthroplasty for varus knee osteoarthritis

Characteristic n r β(95%CI) P-value P for interaction
Age(year)      0.010*
 <65 46(42.59%) -0.474 -0.26 (-0.41, -0.12) 0.001  
 ≥65 62(57.41%) -0.036 -0.02 (-0.14, 0.11) 0.779  
Sex      0.753
 female 89(82.41%) -0.247 -0.13 (-0.24, -0.02) 0.020  
 male 19(17.59%) -0.316 -0.19 (-0.46, 0.08) 0.187  
BMI (kg/m2)      0.101
 <25 24(22.22%) -0.05 -0.02 (-0.17, 0.14) 0.824  
 ≥25 84(77.78%) -0.32 -0.19 (-0.31, -0.07) 0.002  
HKAB (0)      0.237
 ≤ -10 40(37.04%) -0.308 -0.15(-0.30, -0.00) 0.054  
 > -10 68(62.96%) 0.001 0.00 (-0.21, 0.21) 0.992  
HFAB (0)      0.527
 ≤0 26(24.07%) -0.054 -0.11 (-0.28, 0.06) 0.205  
 >0 82(75.93%) -0.298 -0.18(-0.28, -0.07) 0.003  
  1. Abbreviations: CHKA change in Hip-Knee-Ankle angle, CHFA change in hindfoot alignment, BMI body mass index, HKAB preoperative Hip-Knee-Ankle angle, HFAB preoperative hindfoot alignment
  2. *indicates statistical significance at P <0.05