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Related Experiment Videos

Maternal age-specific rates for Down syndrome: changes over time.

P A Baird1, A D Sadovnick

  • 1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.

American Journal of Medical Genetics
|April 1, 1988
PubMed
Summary

Down syndrome (DS) incidence rates at specific maternal ages did not significantly change over a 20-year period in British Columbia. This study analyzed 856 liveborn DS infants from 1964-1983.

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Area of Science:

  • Genetics and Genomics
  • Reproductive Health
  • Epidemiology

Background:

  • Conflicting reports exist regarding changes in Down syndrome (DS) incidence rates across maternal age groups over time.
  • British Columbia offers a unique dataset for this research due to comprehensive DS livebirth ascertainment and extensive demographic and cytogenetic data.
  • Previous studies have yielded inconsistent findings, necessitating further investigation into temporal trends of DS incidence.

Purpose of the Study:

  • To investigate whether incidence rates of Down syndrome (DS) at specific maternal ages have changed over a 20-year period.
  • To analyze temporal trends, including transient, linear, and cyclic changes, in DS incidence while controlling for maternal age.
  • To leverage the comprehensive data available in British Columbia to provide a definitive analysis of DS incidence trends.

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Main Methods:

  • Analysis of 856 liveborn Down syndrome (DS) infants over a 20-year period (1964-1983).
  • Examination of incidence rates adjusted for maternal age to identify temporal changes.
  • Statistical analysis to detect transient, linear, and cyclic trends in DS incidence.

Main Results:

  • No statistically significant changes (P > 0.05) in Down syndrome (DS) incidence were observed across any maternal age group during the 20-year study period.
  • The analysis controlled for maternal age, ensuring that observed rates were specific to age categories.
  • Both transient fluctuations and long-term linear or cyclic trends in DS incidence were found to be non-significant.

Conclusions:

  • The incidence of Down syndrome (DS) at given maternal ages remained stable in British Columbia between 1964 and 1983.
  • This study provides robust evidence against significant temporal changes in DS incidence within maternal age strata during the observed period.
  • The findings contribute to a clearer understanding of DS epidemiology and may inform genetic counseling and public health strategies.