At enrollment in 1992 – 1993, participants who were long-term daily aspirin users were, on average, older and slightly more likely to be white than participants who reported no aspirin use ( Table 1) , although nearly all participants in this cohort were white and older than age 50 years, regardless of aspirin use.
Long-term daily aspirin users were slightly more likely than nonusers to be highly educated, to be former smokers rather than never smokers, to have a high BMI, and to use nonaspirin NSAIDs. In addition, long-term daily aspirin users were considerably more likely than nonusers to have had a history of heart attack, diabetes, or hypertension, presumably refl ecting the use of aspirin to prevent cardiovascular disease.
Among women, long-term daily aspirin users were more likely than nonusers to use hormone replacement therapy (41% versus 30%) but were not more likely to have reported a mammogram in the last year (64% in both groups).
Information on PSA testing and colorectal endoscopy was fi rst collected in 1997.
At that time, long-term daily aspirin users were slightly more likely than nonusers to have ever had a PSA test (77% versus 71% among men) or a colorectal endoscopy (61% versus 55% among men, 52% versus 50% among women).