Risk factors for venous thromboembolic events at 12 months identified by multivariate analysis. HR (95% CI): Hazard ratios and corresponding 95% CIs. Cutoff values for hemoglobin level and leukocyte counts were chosen based on the Khorana score (see supplemental Data). Factors with a hazard ratio of <1 are protective and those with a hazard ratio of >1 are risk factors. Cancer sites in the category “other” include small intestine: 4, soft tissues: 4, muscles: 3, abdominal: 3, cutaneous: 2, vulva: 1 penis: 1, thyroid: 1, thymus: 1, and mediastinum: 1.