JAK2 and Arterial thrombosis: Patients with sole abnormalities other than -Y were older (median age; 65 years vs 58 years; p = 0.001), with higher median leukocyte count (9.3 vs 8.4 × 109/L, p = 0.03) and demonstrated an age-independent association with history of arterial thrombosis (p = 0.007) due to higher prevalence of JAK2 mutation.