In the adult Danish population, heterozygotes for the factor V Leiden mutation had a hazard ratio of 3 for venous thromboembolism
relative to noncarriers of the mutation. For homozygotes, the hazard ratio was 18. When smoking, obesity, and old age were
all present, the absolute 10-year thromboembolic risk was 10% in heterozygotes and 51% in homozygotes.