At enrollment in 1992– 1993, only 2.3% of male participants and 1.3% of female participants met our definition for being long-term daily aspirin users.
However, the prevalence of long-term daily aspirin use increased during the follow-up period. Long-term daily aspirin users contributed 4.6% of the person-time included in this analysis among men and 2.1% of that among women.
Most longterm daily aspirin users reported using either one aspirin pill per day (79% of person-time among men, 56% of person-time among women) or two aspirin pills per day (11% of person-time among men, 20% of person-time among women).