Table 1.
Baseline characteristics of Dallas Heart Study participants with repeat 25(OH)D assessment in 2000–2002 (DHS1) and 2007–2009 (DHS2) (n = 2045)
| DHS1(2000–2002) | DHS2(2007–2009) | |
|---|---|---|
| Men | ||
| Black | 378 (18%) | |
| White | 319 (16%) | |
| Hispanic | 128 (6%) | |
| Women | ||
| Black | 651 (32%) | |
| White | 363 (18%) | |
| Hispanic | 165 (8%) | |
| Age (years) | 44 (37, 52)a | 51 (44, 59)a |
| BMI (kg/m2) | 28.4 (24.7, 33.5)a | 30.1 (26.2, 35.6)a |
| 25(OH)D (nmol/l) | 42.7 (30.0, 60.0)a | 39.4 (27.2, 56.4)a |
| Supplemental Vitamin D Use | 147 (7%) | 471 (23%) |
| Season of Blood Draw | ||
| Fall | 519 (25%) | 540 (26%) |
| Winter | 464 (23%) | 432 (21%) |
| Spring | 365 (18%) | 524 (26%) |
| Summer | 697 (34%) | 549 (27%) |
| Current Smoking | 530 (26%) | 452 (23%) |
Abbreviations: 25(OH)D, 25-hydroxyvitamin D; BMI, body mass index;
a
Median (25, 75 percentiles)