Table 2.
Baseline characteristics of 13,331 participants of NHANES III by 25(OH)D quartiles for multi-category variables. Results presented as means or percents ± standard error.
| 25-hydroxyvitamin D levels (ng/ml)* | ||||
|---|---|---|---|---|
| >32.1 | 24.4-32.1 | 17.8-24.4 | <17.8 | |
| Characteristic | (n=3359) | (n=3242) | (n=3344) | (n=3386) |
| Race (%) | ||||
| Non-Hispanic white | 43.5 ±1.4 | 28.5 ± 0.9 | 18.5 ± 0.8 | 9.5 ± 0.6 |
| Non-Hispanic black | 7.8 ± 0.8 | 14.4 ± 1.0 | 27.5 ± 0.9 | 50.3 ± 2.1 |
| Mexican-American | 20.3 ± 1.3 | 27.1 ± 1.1 | 29.2 ± 1.2 | 23.4 ± 1.6 |
| Other | 19.4 ± 2.7 | 25.9 ± 1.9 | 30.1 ± 2.4 | 24.6 ±2.3 |
| Smoking (%) | ||||
| Never | 34.8 ± 1.5 | 27.8 ± 0.9 | 21.9 ± 0.9 | 15.6 ± 0.9 |
| Former | 39.9 ± 1.9 | 27.4 ± 1.2 | 20.1 ± 1.2 | 12.6 ± 0.9 |
| Current | 37.9 ± 1.4 | 24.6 ± 1.2 | 19.7 ± 1.0 | 17.8 ± 1.1 |
| Season (%) | ||||
| Winter (Jan.-March) | 23.7 ± 1.5 | 24.8 ± 2.0 | 26.0 ± 2.0 | 25.5 ± 1.9 |
| Spring (April-June) | 31.5 ± 1.9 | 29.8 ± 1.1 | 23.1 ± 0.8 | 15.6 ± 1.2 |
| Summer (July-Sept.) | 48.3 ± 1.8 | 26.6 ± 1.4 | 16.2 ± 0.6 | 8.9 ± 0.7 |
| Fall (Oct.-Dec.) | 36.5 ± 1.7 | 25.1 ± 1.4 | 21.1 ± 8.8 | 17.3 ± 1.4 |
| Physical Activity | ||||
| Low (%) | 23.9 ± 1.1 | 25.1 ± 1.1 | 25.5 ± 1.0 | 25.5 ±1.3 |
| Moderate (%) | 37.9 ± 1.3 | 27.8 ± 0.9 | 20.6 ± 0.9 | 13.7 ± 0.8 |
| High (%) | 49.5 ± 2.2 | 26.1 ± 1.0 | 16.1 ± 1.2 | 8.4 ± 0.8 |