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Li Z.,Institute of Reproductive and Child Health | Ye R.,Peking University | Zhang L.,Peking University | Li H.,Institute of Reproductive and Child Health | And 2 more authors.
Hypertension | Year: 2013

Emerging evidence has suggested that folic acid-containing multivitamins may markedly reduce the risk of gestational hypertension or preeclampsia. We examined whether maternal supplementation with folic acid alone during early pregnancy can prevent the occurrence of gestational hypertension and preeclampsia. The data are from a large population-based cohort study established to evaluate the effectiveness of the campaign to prevent neural tube defects with folic acid supplementation in China. We selected participants who were registered in 2 southern provinces, had exact information on folic acid use, and were not affected by chronic hypertension or diabetes mellitus before 20 weeks gestation. A logistic regression model was used to adjust for the effects of the main potential confounders, including age, body mass index, education, occupation, parity, and multiple births. The study size had 99.9% power (α=0.05) to detect a decrease of 10% over the unexposed rate of 9.4% for gestational hypertension. Among the 193 554 women (47.9% took folic acid, 52.1% did not), the overall incidence of gestational hypertension and preeclampsia was 9.5% and 2.5%, respectively. The incidence of gestational hypertension and preeclampsia was 9.7% and 2.5% for women who took folic acid, and 9.4% and 2.4% for women who did not use it. The adjusted risk ratio associated with folic acid use was 1.08 (95% confidence interval, 1.04-1.11) for gestational hypertension and 1.11 (95% confidence interval, 1.04-1.18) for preeclampsia. Our findings suggest that daily consumption of 400 μg folic acid alone during early pregnancy cannot prevent the occurrence of gestational hypertension and preeclampsia. © 2013 American Heart Association, Inc.


Liu J.,Institute of Reproductive and Child Health | Liu J.,Peking University | Wang L.,Institute of Reproductive and Child Health | Wang L.,Peking University | And 14 more authors.
Birth Defects Research Part A - Clinical and Molecular Teratology | Year: 2014

Background:: Maternal tea consumption was reported to increase the risk of fetal neural tube defects (NTDs). Catechol-O-methyltransferase (COMT) may be involved in the metabolism of polyphenolic methylation of tea, thus influence the risk of fetal NTDs. Methods: A total of 576 fetuses or newborns with NTDs and 594 healthy newborns were included in the case-control study. Information on maternal tea consumption, sociodemographic characteristics, reproductive history, and related behavior was collected through face-to-face interviews. Maternal blood samples were collected to examine polymorphisms in COMT, and the possible interaction of COMT and tea consumption was analyzed. RESULTS: After controlling for potential confounders, homozygotes of rs737865 showed an elevated risk for total NTDs (odds ratio [OR]=2.04, 95% confidence interval [CI], 1.24-3.35) and for the anencephaly subtype (OR=1.99, 95% CI, 1.17-3.39). The CC genotype of rs4633 was positively associated with the overall risk of NTDs (OR=3.66, 95% CI, 1.05-12.83). Heterozygotes for rs4680 were associated with a decreased risk of spina bifida (OR=0.71, 95% CI, 0.51-0.98). The COMT rs4680 A allele was negatively related with the risk of spina bifida, with adjusted OR=0.64 (95% CI, 0.45-0.89). An interaction between tea consumption (1 to 2 cups/day) and the rs4680AA/AG genotype was found in the spina bifida subtype (Pinteraction=.08). Conclusion: Several COMT variants were associated with elevated risk of NTDs in a Chinese population. Maternal tea consumption may be associated with an increased risk for fetal NTDs in genetically susceptible subgroups. © 2013 Wiley Periodicals, Inc.

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