Abstract
Purpose
Folic acid supplementation has been suggested to reduce the risk of preterm birth. However, results from previous epidemiologic studies have been inconclusive. We investigated the hypothesis that folic acid supplementation and dietary folate intake during pre- and post-conception reduces the risk of preterm birth.
Methods
We analyzed data from a birth cohort study conducted between 2010 and 2012 in Lanzhou, China, including 10,179 pregnant women with live singleton births.
Results
Compared to non-users, folic acid supplement users with >12-week duration had a reduced risk of preterm birth (OR 0.67, 95 % CI 0.55–0.83) with a significant dose–response relationship (P for trend = 0.01). A similar pattern was observed for spontaneous preterm birth. Stronger associations were seen for ever use of folic acid supplement and very preterm birth (OR 0.50, 95 % CI 0.36–0.69) and spontaneous very preterm birth (OR 0.42, 95 % CI 0.29–0.63). Dietary folate intake during preconception and pregnancy were also associated with reduced risk of preterm birth (OR 0.68, 95 % CI 0.56–0.83, OR 0.57, 95 % CI 0.47–0.70 for the highest quartiles, respectively), particularly for spontaneous very preterm (OR 0.41, 95 % CI 0.24–0.72, OR 0.26, 95 % CI 0.15–0.47 for the highest quartiles, respectively). There were also decreased risks of preterm birth observed per 10-µg increase in dietary folate intake, and similar associations were found after stratification by folic acid supplementation status.
Conclusions
Our results suggest that folic acid supplementation and higher dietary folate intake during preconception and pregnancy reduces the risk of preterm birth, and the protective effect varies by preterm subtypes.
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Abbreviations
- PB:
-
Preterm birth
- PPROM:
-
Preterm premature rupture of membranes
- OR:
-
Odds ratio
- CI:
-
Confidence interval
- BMI:
-
Body mass index
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Acknowledgments
Research supported by internal funding from the Gansu Provincial Maternity and Child Care Hospital, and by the National Institutes of Health Grants (K02HD70324 and R01ES019587).
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Xiaohui Liu, Ling Lv, Hanru Zhang and Nan Zhao have contributed equally to the study.
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Liu, X., Lv, L., Zhang, H. et al. Folic acid supplementation, dietary folate intake and risk of preterm birth in China. Eur J Nutr 55, 1411–1422 (2016). https://doi.org/10.1007/s00394-015-0959-1
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DOI: https://doi.org/10.1007/s00394-015-0959-1