Table 2. Risk factors at baseline.
| Variable, n (%) | NPA-VTE ( N = 1,187) | PA-VTE ( N = 183) |
|---|---|---|
| Provoking risk factors | ||
| Active cancer | 58 (4.9) | 0 (0.0) |
| Acute medical illness | 79 (6.7) | 3 (1.6) |
| Hospitalization | 113 (9.5) | 19 (10.4) |
| Long-haul traveling | 66 (5.6) | 2 (1.1) |
| Surgery | 142 (12.0) | 19 (10.4) |
| Trauma of the lower limb | 106 (8.9) | 0 (0.0) |
| Predisposing risk factors | ||
| Hormone replacement therapy | 31 (2.6) | 4 (2.2) |
| Oral contraception | 405 (34.1) | 4 (2.2) |
| Recent bleed or anemia | 634 (5.3) | 9 (4.9) |
| Chronic heart failure | 11 (0.9) | 1 (0.5) |
| Chronic immobilization | 51 (4.3) | 4 (2.2) |
| Family history of VTE | 95 (8.0) | 17 (9.3) |
| History of cancer | 45 (3.8) | 1 (0.5) |
| Known thrombophilia | 57 (4.8) | 14 (7.7) |
| Prior episode of DVT and/or PE | 128 (10.8) | 12 (6.6) |
| Renal insufficiency | 9 (0.8) | 0 (0.0) |
Abbreviations: DVT, deep vein thrombosis; NPA-VTE, nonpregnancy-associated venous thromboembolism; PA-VTE, pregnancy-associated venous thromboembolism; PE, pulmonary embolism; VTE, venous thromboembolism.
Note: Provoking risk factors occurred during 3 months preceding VTE diagnosis.