Physicians’ treatment decisions for each of the five clinical scenarios. A, A 50-year-old man who presents with smoke-related, secondary erythrocytosis, but who lacks any other cardiovascular risk factors; B, A 50-year-old man, who presents with smoke-related, secondary erythrocytosis and concomitant hypertension; C, A 50-year-old man, who presents with smoke-related, secondary erythrocytosis, and a previous deep venous thrombosis; D, A 50-year-old man, who presents with idiopathic erythrocytosis without any other cardiovascular risk factors; E, A 50-year-old man, who presents with idiopathic erythrocytosis and concomitant hypertension. The association or not of antiplatelet agents was represented as +/− for each Hct threshold. ASA, antiplatelet agents; Hct, hematocrit