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Biological indicators of the in-utero environment and their association with birth weight for gestational age

N M Talge1, C Holzman1, P K Senagore2

  • 11Department of Epidemiology, Michigan State University, East Lansing, MI, USA.

Journal of Developmental Origins of Health and Disease
|January 15, 2013
PubMed

Insights

Birth weight for gestational age (BW/GA) is linked to health risks. This study found associations between lower BW/GA z-scores and conditions like preeclampsia and placental pathology, offering insights into pregnancy complications.

Area of Science:

  • Perinatal Medicine
  • Reproductive Biology
  • Maternal-Fetal Medicine

Background:

  • Birth weight for gestational age (BW/GA) is a critical indicator of infant health, associated with various adverse postnatal outcomes.
  • Existing research often examines pregnancy complications, maternal biomarkers, and placental pathology in isolation, limiting understanding of their interplay and relation to the full BW/GA spectrum.
  • Elucidating these relationships is crucial for understanding variations in postnatal health across the BW/GA continuum.

Purpose of the Study:

  • To investigate the associations between birth weight for gestational age (BW/GA) and a range of biological and clinical indicators of pregnancy complications.
  • To explore the overlap between obstetric complications, maternal serum biomarkers, and placental pathology in relation to the entire BW/GA distribution, not just extremes.
  • To identify factors that may mediate or mark risk in the association between BW/GA and postnatal health outcomes.

Main Methods:

  • Analysis of data from 1371 women in the Pregnancy Outcomes and Community Health Study.
  • Examination of BW/GA z-scores in relation to obstetric complications, second-trimester maternal serum screening results (alpha-fetoprotein, unconjugated estriol), and placental histology.
  • Inclusion of maternal demographics, anthropometrics, and substance use in adjusted statistical models.

Main Results:

  • Adjusted models revealed significant associations between reduced BW/GA z-scores and preeclampsia (β = -0.70), elevated maternal serum alpha-fetoprotein (β = -0.28), elevated unconjugated estriol (β = -0.31), and obstructive vascular pathology in the placenta (β = -0.46).
  • These associations remained consistent even when excluding preterm, small-for-gestational age, or large-for-gestational age infants.
  • The findings highlight specific biological and pathological markers linked to variations in BW/GA across the continuum.

Conclusions:

  • Specific pregnancy complications, maternal serum markers, and placental pathology are associated with lower birth weight for gestational age z-scores.
  • These factors may play a role in mediating or marking the risk associated with BW/GA variations.
  • Further research is warranted to understand the direct mechanisms linking these factors to BW/GA and subsequent health outcomes.

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