Table 2. Prevalence ratio of vitamin D inadequacy, according to seasons and sun exposure status.
| Crude | Adjusted | |||
|---|---|---|---|---|
| PR (95%CI) | p-value | PR (95%CI) | p-value | |
| Seasons | ||||
| Summer | 1 | ---- | 1 | ---- |
| Autumn | 1.01 (0.89–1.13) | 0.933 | 1.01 (0.90–1.14) | 0.989 |
| Spring | 1.14 (1.02–1.28) | 0.020 | 1.15 (1.03–1.29) | 0.010 |
| Winter | 1.16 (1.03–1.29) | 0.010 | 1.18 (1.05–1.32) | 0.004 |
| Sun exposure | ||||
| Outdoor | 1 | ---- | 1 | ---- |
| Indoor | 1.09 (1.03–1.16) | 0.003 | 1.08 (1.01–1.15) | 0.020 |
PR: prevalence ratio; 95%CI: 95% confidence interval. Vitamin D inadequacy: <30 ng/mL. Adjusted model: age range, race/color, and sex. p-values in boldface are significant.