Table I.
Demographic and other characteristics of aspirin users and non-users in 1996 (mid-point) in the Health Professionals Follow-up Cohort (HPFS), 1988–2006.
| Regular users (≥ 2 days/wk) (n=18,570) |
Non-regular users (< 2 days/wk) (n=24,494) |
||
|---|---|---|---|
| % (N) or age-adj. mean (SE) | % (N) or age-adj. mean (SE) | p-value† | |
|
| |||
| Age, yrs (SD) | 64.8 (9.2) | 62.9 (9.5) | <.0001 |
| BMI, kg/m2 | 26.1 (.03) | 26.0 (.02) | 0.21 |
| missing | 8 (0.04) | 18 (0.07) | |
| Recent history of: | |||
| PSA test | 75.5 (14024) | 49.1 (12032) | <.0001 |
| Digital rectal exam | 76.6 (14214) | 51.9 (12722) | <.0001 |
| General physical exam | 85.5 (15883) | 58.4 (14295) | <.0001 |
| Family history of prostate cancer | |||
| Yes | 5.6 (1040) | 5.4 (1329) | 0.43 |
| No | 94.4 (17529) | 94.9 (23,165) | |
| Smoking status | |||
| Never‡ | 46.1 (8568) | 50.7 (12423) | |
| Past | 48.5 (9002) | 42.1 (10320) | <.0001 |
| Current | 5.4 (1000) | 7.2 (1751) | <.0001 |
| Vigorous physical activity, METS*/wk | 13.72 (0.19) | 13.71 (0.16) | 0.03 |
| Red meat, servings/wk** | 0.50 (.004) | 0.44 (.003) | <.0001 |
| Fish intake, servings/wk** | 0.30 (.002) | 0.25 (.002) | <.0001 |
| Total calories, kcal/day** | 2017 (4.87) | 2013 (4.6) | 0.97 |
| Medical history of: | |||
| Myocardial Infarction | 13.1 (2433) | 5.1 (1241) | <.0001 |
| Rheumatoid & other arthritis | 16.1 (2998) | 12.7 (3116) | <.0001 |
| Diabetes | 7.5 (1394) | 6.0 (1470) | <.0001 |
†
F-test for analysis of variance adjusted for age at diagnosis
‡
Includes n=3329 non-users with unknown past use
*
MET=metabolic equivalent task
**
Based on 1994 questionnaire (diet collected every 4 years)