Cardiovascular event-free survival (days), according to the JAK2 617V>F mutational state and adjusted for sex, age, leukocytosis, and history of thrombosis in patients with polycythemia vera or essential thrombocythemia. The hazard ratio (HR), the 95% confidence interval (95% CI), and the corresponding P value are shown on the right for ET patients. WT, Hetero, and Homo indicate patients who were wild-type, heterozygous, or homozygous for the JAK2 617V>F mutation, respectively.