Table 1.

Incidence of thrombotic events related to age in 100 patients with essential thrombocythemia not on aspirin in the 1990 Bergamo study[11]

Age (yr)	No. of patients	Patient/years	Events number	Events % pt/yr
< 40	34	118	2	1.70%
40-60	37	112	7	6.30%
> 60	29	73	11	15%
Total thrombotic events in 20 of 100 ET patients

ET: Essential thrombocythemia.