In a prospective study of the relationship between oral contraceptive use and the subsequent risk of developing heart disease, a cohort of 1000 women were followed for 5 years. The results were as follows:

In a prospective study of the relationship between oral contraceptive use and the subsequent risk of developing heart disease, a cohort of 1000 women were followed for 5 years. The results were as follows:

Present Absent

A 245

B 75

C 50

D 630

A + C = 295 B + D = 705 n = 1000

What is the incidence rate (absolute risk) of endometrial cancer among those who didn?t use oral contraceptives?