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Table 2 Baseline characteristics of patients undergoing primary TKA 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 = 823) FORCE-TJR United States (N = 6,680) Mean difference (95% CI) P-value****
Age at operation, mean [±SD] 72.3 [±9.4] 66.7 [±9.4] 5.6 (4.9; 6.3) 0.000
Preoperative BMI, mean [±SD]* 29.6 [±5.9] 31.53 [±6.2] -1.9 (-1.5; -2.4) 0.000
Mean age in each BMI category, [±SD]     
 <25 72.9 [±10.9] 69.38 [±10.2] 3.5 (1.8; 5.2) 0.000
 25–29.9 74.25 [±8.6] 68.51 [±9.4] 5.8 (4.6; 6.9) 0.000
 30–34.9 71.02 [±8.8] 66.64 [±8.7] 4.4 (3.1; 5.6) 0.000
 ≥35 69.16 [±8.7] 63.29 [±8.5] 5.9 (4.4; 7.3) 0.000
Preoperative scores, mean [±SD]    Mean difference  
(95% CI)/Effect size  
 WOMAC pain 41.0 [±17.9] 51.59 [±19.0] -10.6 (-12.2; -9.1)/0.57 0.000
 WOMAC function 44.82 [±19.2] 52.09 [±18.6] -7.3 (-8.9; -5.7)/0.39 0.000
 SF-12 Physical Component Summary 34.45 [±7.6] 32.68 [±8.3] 1.8 (1.1; -2.5)/0.23 0.000
 SF-12 Mental Component Summary 44.84 [±11.2] 51.40 [±12.3] -6.6 (-7.6; -5.5)/0.56 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