Characteristics of participants of the HPFS by aspirin use at baseline, standardized to the age distribution of the study population
| Baseline characteristics, 1986 | Nonusers of aspirin | Current users of aspirin |
|---|---|---|
| N | 34,848 | 14,547 |
| Frequency of aspirin use, mean (SD; d/mo) | 0.0 | 8.6 (0.0)a |
| Age, mean (SD; y)b | 53.7 (9.7) | 56.5 (9.7) |
| BMI, mean (SD; kg/m2) | 25.5 (3.3) | 25.7 (3.5) |
| Family history of prostate cancer | 12.0% | 11.8% |
| Smoking status | ||
| Never smoker | 45.7% | 41.8% |
| Past smoker | 39.6% | 47.3% |
| Current smoker | 9.3% | 10.4% |
| Missing | 5.4% | 0.5% |
| Total physical activity, mean (SD; METS-h/wk) | 18.8 (26.5) | 18.6 (26.1) |
| Diabetes diagnosis | 3.0% | 3.6% |
| Cumulative incidence, by 2009 | ||
| Prostate cancer diagnosis | 12.5% | 12.7% |
| Prostate cancer death | 1.3% | 1.1% |
| Overall mortality | 27.7% | 30.8% |