Potential combined effects of maternal smoking and coffee intake on foetal death within the Danish National Birth Cohort

European Journal of Public Health
Maria M Morales-Suárez-VarelaBodil Hammer Bech

Abstract

Several studies have linked coffee intake and smoking to foetal death, but a possible interaction between both exposures remains unknown. We studied, within the Danish National Birth Cohort, the potential interaction between smoking and coffee drinking while pregnant on the risk of foetal (early and late) death. The study included 90 086 pregnant women, with information about their smoking habit and coffee intake in early pregnancy, and several potential confounding factors. Interaction was studied by calculating both the hazard ratio (HR) in Cox's regression (linear and smoothed restricted cubic spline) and the interaction contrast ratio (ICR). Women who neither smoked nor drank coffee were used as the reference group. Drinking more than 3 cups/d of coffee was associated with the highest risk of foetal death, spontaneous abortion and stillbirth for all smoking status (non-smoker, ≤10 or > 10 cigarettes/d). Among smokers, the combination with drinking <3 cups/d of coffee presented the lowest HRa for foetal death, spontaneous abortion and stillbirth. The ICRs were negative when considering smokers who had a coffee intake up to 3 cups/d, but they were positive for those who had a higher coffee intake, suggesting the effect of cof...Continue Reading

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Citations

Jan 25, 2019·Scientific Reports·Yimin QuYu Jiang

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