Postmenopausal Estrogen Replacement and Risk for Venous Thromboembolism

Figure 1. Odds ratios for thromboembolic events were higher in the first or second year than in subsequent years in all six
studies reporting results by year of use.
Risk for venous thromboembolism by year of estrogen use.
-
Ann Intern Med
May 7, 2002
vol. 136
no. 9
680-690