Table 3.
Odds ratio and 95% confidence interval for vitamin D levels from the multivariable logistic regression (N = 1594)
| Model 1 | Model 2 | Model 3 | Model 4 | |||||
|---|---|---|---|---|---|---|---|---|
| OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| Sampling month | ||||||||
| 12–2 | 1 | 1 | 1 | 1 | ||||
| 3–5 | 2.228** | 1.355,3.663 | 2.201** | 1.328,3.648 | 2.257** | 1.358,3.750 | 2.248** | 1.350,3.743 |
| 6–8 | 2.170*** | 1.443,3.263 | 2.127*** | 1.407,3.216 | 2.103*** | 1.390,3.180 | 2.094*** | 1.383,3.173 |
| 9–11 | 2.227** | 1.336,3.714 | 2.115** | 1.251,3.575 | 2.169** | 1.282,3.671 | 2.104** | 1.240,3.571 |
| Age (years) | ||||||||
| 20–29 | 1 | 1 | 1 | |||||
| 30–39 | 2.383*** | 1.558,3.916 | 2.414*** | 1.519,3.834 | 2.383*** | 1.494,3.800 | ||
| ≥ 40 | 2.279** | 1.415,4.597 | 2.296** | 1.242,4.243 | 2.279* | 1.221,4.254 | ||
| Marital status | ||||||||
| Unmarried | 1 | 1 | 1 | |||||
| Married or other | .991 | .677,1.449 | .970 | .660,1.426 | 1.019 | .689,1.507 | ||
| Education | ||||||||
| Diploma | 1 | 1 | 1 | |||||
| Bachelor | 1.346 | .827,2.190 | 1.374 | .843,2.238 | 1.405 | .860,2.295 | ||
| Master’s or higher | 1.284 | .709,2.326 | 1.355 | .745,2.463 | 1.324 | .726,2.415 | ||
| Shift work | ||||||||
| Yes | 1 | 1 | ||||||
| No | 1.193 | .821,1.734 | 1.233 | .847,1.797 | ||||
| Overtime hours (week) | .963 | .927,1.001 | .964 | .927,1.002 | ||||
| BMI | ||||||||
| Underweight | 1 | |||||||
| Normal | .775 | .463,1.300 | ||||||
| Overweight | .814 | .462,1.435 | ||||||
| Physical activity | 1.001 | .996,1.005 | ||||||
| Depressive symptoms | ||||||||
| Minimal | 1 | |||||||
| Mild | 1.408 | .967,2.051 | ||||||
| Moderate | 1.183 | .604,2.317 | ||||||
| Moderately severe above | 2.457 | .950,6.357 | ||||||
| Stress symptoms | .942** | .900,.985 | ||||||
| Nagelkerke R2 | .024 | .058 | .064 | .076 | ||||
| Chi/df | 18.879/3 | 46.855/8 | 51.737/10 | 61.644/17 | ||||
*p < .05, **p < .01, ***p < .001.