Skip to main content

Advertisement

Table 4 Baseline characteristics of patients undergoing primary THA for continuous variables

From: Important patient characteristics differ prior to total knee arthroplasty and total hip arthroplasty between Switzerland and the United States

  Geneva registry Switzerland (N = 1,023) FORCE-TJR United States (N = 4,647) Mean difference (95% CI) P-value****
Age at operation, mean [±SD] 68.2 [±12.9] 64.6 [±10.7] 3.6 (2.8; 4.3) 0.000
Preoperative BMI, mean [±SD]* 26.87 [±5.0] 29.12 [±5.7] -2.2 (-1.9; -2.6) 0.000
Mean age in each BMI category, [±SD]     
 <25 68.61 [±14.7] 66.35 [±11.5] 2.3 (3.7; 0.8) 0.000
 25–29.9 68.55 [±12.2] 65.42 [±10.4] 3.1 (1.9; 4.3) 0.000
 30–34.9 67.24 [±11.0] 63.82 [±10.1] 3.4 (1.8; 5.1) 0.000
 ≥35 65.68 [±8.8] 61.17 [±9.8] 4.5 (2.1; 7.0) 0.000
Preoperative scores, mean [±SD]    Mean difference  
(95% CI)/Effect size  
 WOMAC pain 39.51 [±18.5] 47.81 [±19.8] -8.3 (-9.8; -6.8)/0.43 0.000
 WOMAC function 40.21 [±19.5] 44.24 [±19.2] -4.0 (-5.6; -2.5)/0.21 0.000
 SF-12 Physical Component Summary 33.39 [±7.9] 31.26 [±8.5] 2.1 (1.5; 2.8)/0.26 0.000
 SF-12 Mental Component Summary 43.91 [+11.7] 49.97 [±12.6] -6.1 (-7.0; -5.1)/0.5 0.000
  1. *BMI was available for 6,452 TKAs (96.6%) from FORCE-TJR
  2. **In the Geneva cohort information on education was routinely collected only since 2012
  3. ***FORCE-TJR collects RA versus OA
  4. ****Pearson chi2 tests were used for categorical variables, and two-sample Wilcoxon rank-sum (Mann-Whitney) tests were used for continuous variables