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Season of birth and autistic disorder in Israel

Y Barak1, A Ring, J Sulkes

  • 1Yehuda Abarbanel Mental Health Center, Bat-Yam, Israel.

The American Journal of Psychiatry
|May 1, 1995
PubMed

Insights

Infantile autism risk is higher for babies born in March and August. This study in Israel supports earlier findings linking specific birth months to autistic disorder development.

Area of Science:

  • Neurodevelopmental Disorders
  • Epidemiology
  • Perinatal Research

Background:

  • Autistic disorder is a complex neurodevelopmental condition with multifactorial etiology.
  • Previous research suggests potential environmental influences on autism risk, including seasonal factors.

Purpose of the Study:

  • To investigate the association between month of birth and the risk of infantile autism.
  • To determine if specific birth months represent a risk factor for developing autistic disorder.

Main Methods:

  • Retrospective analysis of 188 autistic patients registered in Israel (1964-1986).
  • Comparison of birth month data of autistic children with the general live birth distribution in Israel.
  • Calculation of risk ratio estimates for each birth month.

Main Results:

  • A statistically significant increase in infantile autism diagnoses was observed for children born in March and August.
  • This seasonal birth pattern for autism was consistent across all study years.
  • A higher incidence of autistic births occurred between 1970 and 1976.

Conclusions:

  • The findings reinforce previous studies indicating that birth in March and August is a risk factor for autistic disorder.
  • This research contributes to understanding potential environmental or seasonal influences on autism development.
  • The study highlights the need for further investigation into the mechanisms underlying seasonal variations in autism risk.
Abstract

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