F8 and deep vein thrombosis: The relative risks were found to be 15.0 (95% CI 8.6–26.1) for PE, 27.8 (95% CI 16.9–45.8) for DVT, and 43.2 (95% CI 16.6–122.5) for PE with DVT, suggesting that FVIII levels play different roles in the DVT and PE etiology [31].