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2 results

  • Folic acid supplementation, dietary folate intake and risk of small for gestational age in China

  • Huaqi Guo, Baohong Mao, Meng Wang, Qing Liu, Liping Yang, Yahui Xie, Yanxia Wang, Xiaochun He, Hongmei Cui, Xiaojuan Lin, Ling Lv, Min Zhou, Xiaoying Xu, Jie Qiu, Yawei Zhang
  • Journal:
    Public Health Nutrition / Volume 23 / Issue 11 / August 2020
    Published online by Cambridge University Press:
    02 December 2019, pp. 1965-1973
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  • Objective:

    To investigate the hypothesis that folic acid supplementation and dietary folate intake before conception and during pregnancy reduce the risk of small for gestational age (SGA) and to examine the joint effect of folic acid supplementation and dietary folate intake on the risk of SGA.

    Design:

    Participants were interviewed by trained study interviewers using a standardized and structured questionnaire. Information on birth outcomes and maternal complications was abstracted from medical records and dietary information was collected via a semi-quantitative FFQ before conception and during pregnancy.

    Setting:

    A birth cohort data analysis using the 2010–2012 Gansu Provincial Maternity and Child Care Hospital.

    Participants:

    Women (n 8758) and their children enrolled in the study.

    Results:

    Folic acid supplementation was associated with a reduced risk of SGA (OR = 0·72, 95 % CI 0·60, 0·86), with the reduced risk seen mainly for SGA at ≥37 weeks of gestational age (OR = 0·70, 95 % CI 0·58, 0·85) and nulliparous SGA (OR = 0·67, 95 % CI 0·54, 0·84). There was no significant association between dietary folate intake and SGA risk.

    Conclusions:

    Our study suggested that folic acid supplementation was associated with a reduced risk of SGA and the risk varied by preterm status and parity.

  • Magnetostratigraphic dating of the Linyi Fauna and implications for sequencing the mammalian faunas on the Chinese Loess Plateau

  • Yahui Qiu, Hong Ao, Yunxiang Zhang, Peixian Shu, Yongxiang Li, Xingwen Li, Peng Zhang
  • Journal:
    Quaternary Research / Volume 89 / Issue 3 / May 2018
    Published online by Cambridge University Press:
    30 October 2017, pp. 629-644

  • The Chinese Loess Plateau (CLP) in North China is an important terrestrial archive that witnessed the environmental changes and mammal and early human evolution in Asia over the past 2.6 Ma. Establishing precise ages for the Pleistocene faunas on the CLP is critical for better understanding of these environmental, biological, and archaeological issues. Here we report a new magnetostratigraphic record that places age constraints on the Linyi Fauna on the southeastern CLP. Our investigated 170-m-thick Linyi section mainly consists of two portions: (1) an overlying eolian Quaternary loess-paleosol sequence and (2) underlying fluvial-lacustrine sand and silty clay. Paleomagnetic results suggest that the composite section records the Brunhes chron, Jaramillo and Olduvai subchrons, and successive reverse polarity portions of the intervening Matuyama chron. The Linyi Fauna is located between Jaramillo and Olduvai subchrons in the fluvial-lacustrine interval, with an estimated age of ~1.5–1.6 Ma. Combining previously dated faunas, we establish a Pleistocene magnetochronology spanning from 2.54 to 0.65 Ma for the faunas on the CLP.