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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

From: In utero exposure to extra vitamin D from food fortification and the risk of subsequent development of gestational diabetes: the D-tect study

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
  1. aWinter: November to January; Spring: February to April; Summer: May to July; Autumn: August to October