Table 1.
Baseline characteristics of patients undergoing primary TKA for categorical variables
| 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) |