Table 1. Patient demographic and lifestyle characteristics at enrollment (n = 1023).
| Characteristic | No. of patients (%) |
| Gender | |
| Female | 553 (54.1) |
| Male | 470 (45.9) |
| Age (years) | |
| <40 | 49 (4.8) |
| 40–49 | 172 (16.8) |
| 50–59 | 311 (30.4) |
| 60–69 | 267 (26.1) |
| ≥ 70 | 224 (21.9) |
| Drug use | |
| Aspirin | |
| no | 844 (82.5) |
| yes | 80 (7.8) |
| unknown | 99 (9.7) |
| Non-selective NSAID* | |
| no | 899 (87.9) |
| yes | 23 (2.2) |
| unknown | 101 (9.9) |
| COX-2-selective NSAID | |
| no | 912 (89.1) |
| yes | 9 (0.9) |
| unknown | 102 (10.0) |
| Smoking status | |
| never | 553 (54.1) |
| former | 199 (19.4) |
| current | 153 (15.0) |
| unknown | 118 (11.5) |
| Body mass index (kg/m2) | |
| <25 | 355 (34.7) |
| 25–29 | 310 (30.3) |
| ≥ 30 | 111 (10.9) |
| unknown | 247 (24.1) |
*
Nonsteroidal anti-inflammatory drug.