Table 3.
Crude odds ratio (OR) and 95% confidence intervals (95%CI) for gestational diabetes mellitus among women prenatally exposed and unexposed to vitamin D fortified margarine stratified by women’s season of birth
| Seasons of birtha | N | % GDM | Crude | |||
|---|---|---|---|---|---|---|
| Exposure | OR | 95%CI | p-value | |||
| Winter | Unexposed | 3465 | 2.3 | 1 | ||
| Exposed | 3214 | 2.3 | 0.98 | 0.71, 1.35 | 0.92 | |
| Spring | Unexposed | 3722 | 2.6 | 1 | ||
| Exposed | 3568 | 1.8 | 0.68 | 0.50, 0.94 | 0.02 | |
| Summer | Unexposed | 3875 | 2.5 | 1 | ||
| Exposed | 3675 | 2.0 | 0.83 | 0.61, 1.13 | 0.23 | |
| Autumn | Unexposed | 3793 | 2.4 | 1 | ||
| Exposed | 3559 | 2.4 | 1.02 | 0.75, 1.38 | 0.91 | |
aWinter: November to January; Spring: February to April; Summer: May to July; Autumn: August to October