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Table 3 Baseline characteristics of patients undergoing primary THA 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 = 1,023) FORCE-TJR United States (N = 4,647) Risk difference (95% CI) P-value****
Women (N, %) 590 (57.7) 2,660 (57.2) 0.5 (-2.9; 3.8) 0.788
Age in categories (N, %)     0.000
 <60 years of age 231 (22.6) 1,435 (31.0) -8.4 (-11.8; -5.1)  
 60 to 79.9 years of age 599 (58.6) 2,813 (60.8) -2.2 (-7.4; 3.0)  
 ≥80 years of age 193 (18.9) 380 (8.2) 10.7 (7.9; 13.4)  
Preoperative BMI categories (N, %)*     0.000
 <25 381 (37.5) 1,104 (24.3) 13.1 (9.1; 17.1)  
 25–29.9 397 (39.0) 1,692 (37.3) 1.7 (-2.5; 6.0)  
 30–34.9 173 (17.0) 1,056 (23.3) -6.3 (-9.2; -3.4)  
 ≥35 66 (6.5) 683 (15.1) -8.6 (-10.5; -6.6)  
Education (N, %)**     0.000
 <= 8 years 126 (38.3) 36 (0.8) 37.5 (30.8; 44.2)  
 9–12 years (high school) 104 (31.6) 1134 (25.7) 5.9 (-0.4; 12.1)  
 > = 13 years (college) 99 (30.1) 3238 (73.5) -43.4 (-49.8; -36.9)  
Co-morbidities (N, %)     
 Diabetes 98 (9.6) 543 (11.7) -2.1 (-4.2; 0.0) 0.017
 Cardiac disease 80 (7.8) 330 (7.1) 0.7 (-1.2; 2.6) 0.610
 Stroke 38 (3.7) 116 (2.5) 1.2 (0.0; 2.5) 0.050
Primary OA (N, %) 834 (81.5) 4,190 (90.2)*** -8.7 (-11.2; -6.1)