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Table 2 Multiple logistic regression analysis of factors for vitamin D deficiency

From: Prevalence of vitamin D deficiency in the pregnant women: an observational study in Shanghai, China

PredictorsP-valueOdds ratio95% confidence interval
Season
 Spring1.000Reference
 Summer0.4511.0260.960–1.096
 Autumn< 0.0010.8410.786–0.899
 Winter< 0.0010.6070.566–0.652
Categorical age
 18–241.000Reference
 25–29< 0.0010.6730.564–0.803
 30–35< 0.0010.5770.484–0.688
  > 35< 0.0010.5500.456–0.664
Year
 20141.000Reference
 2015< 0.0011.1861.101–1.277
 2016< 0.0011.2241.139–1.316
 2017< 0.0010.5540.517–0.594