Table 1.
Baseline Characteristics of the 25,871 Study Participants, According to Randomized Vitamin D Assignmenta
| Baseline Characteristic | All Participants | Vitamin D | |
|---|---|---|---|
| Active | Placebo | ||
| N | 25,871 | 12,927 | 12,944 |
| Sex, % female | 13085 (50.6) | 6547 (50.6) | 6538 (50.5) |
| Mean age ± SD, years | 67.1 ± 7.1 | 67.1 ± 7.0 | 67.1 ± 7.1 |
| ≥75 | 3318 (12.8) | 1658 (12.8) | 1660 (12.8) |
| Race/ethnicity, % | |||
| Non-Hispanic White | 18046 (71.3) | 9013 (71.3) | 9033 (71.4) |
| African American | 5106 (20.2) | 2553 (20.2) | 2553 (20.2) |
| Hispanic (not African American) | 1013 ( 4.0) | 516 ( 4.1) | 497 ( 3.9) |
| Asian/Pacific Islander | 388 ( 1.5) | 188 ( 1.5) | 200 ( 1.6) |
| American Indian/Alaskan Native | 228 ( 0.9) | 118 ( 0.9) | 110 ( 0.9) |
| Other/unknown | 523 ( 2.1) | 259 ( 2.0) | 264 ( 2.1) |
| Mean body mass index ± SD, kg/m2 | 28.1 (5.7) | 28.1 (5.7) | 28.1 (5.8) |
| Current smoking, % | 1836 ( 7.2) | 921 ( 7.2) | 915 ( 7.2) |
| Hypertension, treated with medication, % | 12791 (49.8) | 6352 (49.5) | 6439 ( 50.1) |
| Cholesterol-lowering medication (current use), % | 9524 (37.5) | 4822 (38.0) | 4702 (36.9) |
| Diabetes, % | 3549 (13.7) | 1812 (14.0) | 1737 (13.4) |
a
Abbreviations: SD = standard deviation. There were no significant differences in the baseline characteristics between the groups.