Skip to main content

Advertisement

Table 1 Baseline characteristics of patients undergoing primary TKA for categorical 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) Risk difference (95% CI) P-value****
Women (N, %) 567 (68.9) 4,142 (62.0) 6.9 (3.5; 10.3) 0.000
Age in categories (N, %)     0.000
 <60 years of age 75 (9.1) 1,462 (21.9) -12.8 (-15.2; -10.5)  
 60 to 79.9 years of age 555 (67.4) 4,623 (69.3) -1.9 (-7.8; 4.1)  
 ≥80 years of age 193 (23.5) 586 (8.8) 14.7 (11.3; 18.1)  
Preoperative BMI categories (N, %)*     0.000
 <25 177 (21.5) 832 (12.9) 8.6 (5.3; 11.9)  
 25–29.9 295 (35.8) 2,053 (31.8) 4.0 (-0.3; 8.3)  
 30–34.9 211 (25.6) 1,869 (29.0) -3.3 (-7.0; 0.4)  
 ≥35 140 (17.0) 1,698 (26.3) -9.3 (-12.4; -6.2)  
Education (N, %)**     0.000
 <= 8 years 140 (41.1) 104 (1.6) 39.4 (32.6; 46.2)  
 9–12 years (high school) 110 (32.3) 2060 (32.3) 0.0 (-6.2; 6.2)  
 > = 13 years (college) 91 (26.7) 4216 (66.1) -39.4 (-45.2; -33.6)  
Co-morbidities (N, %)     
 Diabetes 145 (17.6) 1,125 (16.8) 0.8 (-2.3; 3.8) 0.932
 Cardiac disease 48 (5.8) 531 (7.9) -2.1 (-3.9; -0.3) 0.013
 Stroke 24 (2.9) 209 (3.1) -0.2 (-1.5; 1.0) 0.545
Primary OA (N, %) 719 (87.4) 5,886 (88.1)*** -0.7 (-3.2; 1.7)