Table 2. Baseline Characteristics of Participants Who Took Calcium Supplements vs Those Who Did Not.
| Baseline Characteristic | Patients, No. (%) (N = 4751) | |
|---|---|---|
| Without Supplements (n = 4064) | With Supplements (n = 687) | |
| Age, mean (SD), y | 69.4 (5.1) | 69.4 (5.1) |
| Sex | ||
| Male | 2015 (49.6) | 81 (11.8) |
| Female | 2049 (50.4) | 606 (88.2) |
| Race | ||
| White, non-Hispanic origin | 3875 (95.3) | 668 (97.2) |
| Black, non-Hispanic origin | 161 (4.0) | 16 (2.3) |
| Hispanic | 11 (0.3) | 2 (0.3) |
| Asian or Pacific Islander | 8 (0.2) | 0 |
| Other | 9 (0.2) | 1 (0.1) |
| Educational attainment | ||
| ≤High school | 1494 (36.8) | 214 (31.1) |
| Some college | 1172 (28.8) | 237 (34.5) |
| College graduate | 1398 (34.4) | 236 (34.4) |
| Smoking status | ||
| Never | 1740 (42.8) | 365 (53.1) |
| Former | 1985 (48.8) | 286 (41.6) |
| Current | 339 (8.3) | 36 (5.2) |
| BMI | ||
| ≤25.0 | 1224 (30.1) | 326 (47.5) |
| >25.0 and ≤30 | 1751 (43.1) | 233 (33.9) |
| >30.0 | 1089 (26.8) | 128 (18.6) |
| Diabetes mellitus | ||
| Yes | 363 (8.9) | 35 (5.1) |
| No | 3701 (91.1) | 652 (94.9) |
| Age-Related Eye Disease Study treatment assignment | ||
| Placebo | 1262 (31.1) | 218 (31.7) |
| Antioxidants | 1271 (31.3) | 210 (30.6) |
| Zinc | 764 (18.8) | 138 (20.1) |
| Antioxidants plus zinc | 767 (18.9) | 121 (17.6) |
| Antacid use | ||
| Absent | 3406 (83.8) | 556 (80.9) |
| Present | 658 (16.2) | 131 (19.1) |
| Nonsteroidal anti-inflammatory drug use | ||
| Absent | 2766 (68.1) | 445 (64.8) |
| Present | 1298 | 242 (35.2) |
Abbreviation: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared).