Prognostic factors for recurrent venous thromboembolism*
| Prognostic factors | Relative risk (95% CI) |
|---|---|
| *Relative risks were adjusted for age, presence or absence of a first symptomatic pulmonary embolism, factor V Leiden, factor II G20210A, elevated factor VIII or factor IX concentrations, and duration of anticoagulation. | |
| †Not significant. | |
| Male sex (v female sex) | 3.6 (2.3 to 5.5) |
| Age (per 10 y increase) | 1.1 (0.9 to 1.3)† |
| Symptomatic pulmonary embolism (v deep venous thrombosis) | 1.7 (1.1 to 2.5) |
| Factor V Leiden (v absence) | 1.2 (0.8 to 1.8)† |
| Factor II G20210A (v absence) | 2.1 (1.1 to 3.8) |
| Factor VIII ⩾234 IU/dl (v <234 IU/dl [23.4 U/l]) | 2.9 (1.6 to 5.1) |
| Factor IX ⩾138 IU/dl (v <138 IU/dl [13.8 U/l]) | 1.3 (0.8 to 2.0)† |
| Duration of anticoagulation (per 3 mo increase) | 1.02 (0.98 to 1.05)† |