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The association of maternal dietary folate intake and folic acid supplementation with small-for-gestational-age births: a cross-sectional study in Northwest China

  • Shanshan Li (a1), Danmeng Liu (a1), Ruo Zhang (a1), Fangliang Lei (a1), Xin Liu (a1), Yue Cheng (a2), Chao Li (a1), Mengyao Xiao (a1), Leqian Guo (a1), Minmin Li (a1), Binyan Zhang (a1), Zhonghai Zhu (a1), Guoshuai Shi (a1), Yezhou Liu (a1), Shaonong Dang (a1) and Hong Yan (a1) (a3)...

Abstract

The effect of maternal folate intake on small-for-gestational-age (SGA) births remains inconclusive. The present study aimed to investigate the associations of maternal folate intake from diet and supplements with the risk of SGA births using data from a cross-sectional study in Shaanxi Province of Northwest China. A total of 7307 women who were within 12 months (median 3; 10th–90th percentile 0–7) after delivery were included. Two-level models were adopted to examine the associations of folate (dietary folate, supplemental folic acid and total folate) intake with the risk of SGA births and birth weight Z score, controlling for a minimum set of confounders that were identified in a directed acyclic graph. Results showed that a higher supplemental folic acid intake during the first trimester was negatively associated with the risk of SGA births (≤60 d v. non-use: OR 0·80; 95 % CI 0·66, 0·96; >60 d v. non-use: OR 0·78; 95 % CI 0·65, 0·94; Ptrend = 0·010; per 10-d increase: OR 0·97; 95 % CI 0·95, 0·99). A higher total folate intake during pregnancy was associated with a reduced risk of SGA births (highest tertile v. lowest tertile: OR 0·77; 95 % CI 0·64, 0·94; Ptrend = 0·010; per one-unit increase in the log-transformed value: OR 0·81; 95 % CI 0·69, 0·95). A similar pattern was observed for the birth weight Z score. Our study suggested that folic acid supplementation during the first trimester and a higher total folate intake during pregnancy were associated with a reduced risk of SGA births.

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Corresponding author

*Corresponding authors: Professor S. Dang, fax +86 29 82655104, email tjdshn@mail.xjtu.edu.cn; Professor H. Yan, fax +86 29 82655104, email xjtu_yh.paper@aliyun.com

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