Factors associated with oral contraceptive use.

We studied factors associated with oral contraceptive (OC) use among 1,855 premenopausal women who were admitted to hospital with conditions unrelated to OC use. Among this group, 15 per cent reported having used OCs within the preceding year and 35 per cent reported having last used them more than a year previously. A higher estrogenic dose (more than 60 micrograms) was reported by past users; the relationship of numerous other variables to past and present OC use is reported.