Abstract
Existing evidence on the relationship between maternal tea consumption and pregnancy induced hypertension (PIH) is inconclusive. This study aimed to evaluate the association between maternal tea consumption and the risk of PIH. This study analysed the data of women without chronic hypertension who participated in a retrospective birth cohort study conducted from 2010 to 2012 at the Gansu Provincial Maternity and Child Care Hospital in Lanzhou, China. Multivariable logistic regression models were used to estimate the association between tea consumption and the risk of PIH and its clinical subtypes by different tea exposure time windows. Among the 10,452 women included in this study, tea consumption during pregnancy was significantly associated with an increased risk of PIH (odds ratio [OR]=1.44, 95% confidence interval [CI]: 1.01, 2.05), gestational hypertension (OR=1.86, 95% CI: 1.07, 3.21), and early-onset preeclampsia (OR=2.93, 95% CI: 1.21, 7.09). This was especially the case with black tea (OR=3.57, 95% CI: 1.67, 7.62). Tea consumption during pregnancy might be associated with an increased risk of PIH, gestational hypertension, and early-onset preeclampsia. These findings have important implications for public health in reducing the PIH.
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