Table 2.
Adjusted Risk for VTE Recurrence Based on Cox Proportional Hazards Regression Modela
| Risk factor | Adjusted hazard ratio | P value |
| Parenteral anticoagulant use | 0.51 (95% CI, 0.43–0.60) | <.01 |
| Days from VTE diagnosis to warfarin initiation | 1.01 (95% CI, 1.01–1.02) | <.01 |
| Outpatient PE index event (ref, DVT) | 0.95 (95% CI, 0.74–1.21) | .66 |
| Elixhauser Comorbidity Index | 1.12 (95% CI, 1.07–1.17) | <.01 |
| Male sex (ref, female) | 0.98 (95% CI, 0.84–1.15) | .83 |
| Age | 0.989 (95% CI, 0.981–0.997) | .01 |
a
The health insurance types were adjusted in the regression analysis; the results are not shown.
CI indicates confidence interval; DVT, deep-vein thrombosis; PE, pulmonary embolism; VTE, venous thromboembolism.