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Neural tube defects: is a decreasing prevalence associated with a decrease in severity?

Amanda M Cotter1, Sean F Daly

  • 1Coombe Women's Hospital, Dublin 8, Ireland. acotter@med.miami.edu

European Journal of Obstetrics, Gynecology, and Reproductive Biology
|April 6, 2005
PubMed
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Neural tube defects (NTDs) prevalence significantly decreased over 25 years in a high-prevalence area. This decline was linked to a reduction in severe NTD cases, even before widespread folic acid interventions.

Area of Science:

  • Obstetrics and Gynecology
  • Public Health
  • Pediatric Neurology

Background:

  • Neural tube defects (NTDs) exhibit high prevalence in specific geographic regions.
  • Understanding trends in NTD birth prevalence is crucial for public health initiatives.
  • Investigating changes in NTD types alongside prevalence shifts provides valuable insights.

Purpose of the Study:

  • To determine the birth prevalence of NTDs over a 25-year period at an institution in a high-prevalence area.
  • To assess if a decreasing NTD prevalence correlated with changes in the types of NTDs observed.
  • To analyze NTD trends in relation to public health interventions.

Main Methods:

  • Retrospective review of all NTD-affected births at Coombe Women's Hospital from 1975 to 1999.

Related Experiment Videos

  • Analysis of 522 NTD-affected births out of 171,260 total births during the study interval.
  • Statistical evaluation of prevalence and severity trends.

    • Main Results:

    • A significant decrease in NTD prevalence was observed from 1975 to 1999 (P < 0.0001).
    • The reduction in NTD prevalence was strongly associated with a significant decrease in severe forms of NTDs (P < 0.0001).
    • The most dramatic decline in NTD rate and severity occurred before the implementation of food fortification or periconceptual folic acid supplementation.

    Conclusions:

    • The transition from high to low NTD prevalence at this institution was accompanied by a significant reduction in severe NTD cases.
    • These findings highlight a natural decline in severe NTDs preceding widespread folic acid interventions.
    • The study underscores the importance of monitoring NTD trends in high-prevalence areas.