Table 4.
Multiple logistic regression analysis showing the relationship between baseline predictors and serum levels of 25(OH)D
| Explanatory variables | 25(OH)D < 20 ng/mL | ||
|---|---|---|---|
| OR | 95% CI | P value | |
| BMI (kg/m2) | 1.03 | 1.04 to 1.18 | 0.007 |
| < 18.5 | 1.36 | 0.57 to 3.89 | 0.42 |
| 18.5-24.9 | 1 | ||
| 25-30 | 1.04 | 0.56 to 1.99 | 0.7 |
| > 30 | 4.18 | 1.94 to 9.03 | < 0.001 |
| Season | |||
| Winter | 1 | ||
| Spring | 0.74 | 0.35 to 1.53 | 0.41 |
| Summer | 0.24 | 0.12 to 0.45 | < 0.001 |
| Autumn | 0.58 | 0.21 to 1.65 | 0.28 |
| Depression (CES-D score ≥ 16 | |||
| Yes | 1.72 | 0.89 to 3.27 | 0.078 |
| No | 1 | ||
| Smoking | |||
| Ex | 1 | 1.78 to 5.37 | < 0.001 |
| Current | 3.18 | ||
| Comorbidity | |||
| < 2 | 1 | ||
| ≥ 2 | 5.32 | 1.67 to 9.75 | < 0.001 |
| Dietary habits | |||
| Non-vegetarian | 1 | ||
| Vegetarian | 2.98 | 1.12 to 3.47 | < 0.001 |
| Body complexion | |||
| Clear | 1 | ||
| Fair | 0.43 | 0.22 to 0.69 | 0.12 |
| Black | 4.92 | 2.87 to 6.23 | < 0.001 |
Abbreviations: BMI = body mass index; CES-D = Centre for Epidemiologic Studies Depression Scale.