Association of microtia with maternal obesity and periconceptional folic acid use

Chen Ma, Suzan L. Carmichael, Angela E. Scheuerle, Mark A. Canfield, Gary M. Shaw

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The study objective was to examine the association of microtia with maternal intake of folic-acid-containing supplements and obesity. The study data included deliveries from 1997 to 2005 from the National Birth Defects Prevention Study. Non-syndromic cases of microtia were compared to non-malformed, population-based liveborn control infants, by estimating adjusted odds ratios (AORs) and 95% confidence intervals (CIs) from logistic regression models that included maternal race/ethnicity, education, and study site. Maternal obesity was only weakly associated with microtia. Maternal periconceptional intake of folic-acid-containing vitamin supplements reduced the risk for microtia, but only among non-obese women (OR: 0.63; 95% CI: 0.44-0.91). The reduced risk was stronger when analyses were restricted to isolated cases (OR: 0.51; 95% CI: 0.34-0.77), and it was independent of the level of maternal dietary folate intake. Adjusting for maternal race/ethnicity did not reveal alternative interpretations of this association. This analysis suggests that maternal periconceptional intake of folic-acid-containing supplements may provide protection from microtia for non-obese women.

Original languageEnglish (US)
Pages (from-to)2756-2761
Number of pages6
JournalAmerican Journal of Medical Genetics, Part A
Issue number11
StatePublished - Nov 2010


  • Anotia
  • Birth defect
  • Ear
  • Epidemiology
  • Folic acid
  • Microtia
  • Obesity
  • Risk factor
  • Vitamin supplements

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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