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International trends in postneonatal mortality.

E A Mitchell1

  • 1Department of Paediatrics, University of Auckland, New Zealand.

Archives of Disease in Childhood
|June 1, 1990
PubMed
Summary

Infant mortality rates in infants aged 1-5 months varied by country, with a notable increase in Sudden Infant Death Syndrome (SIDS) in New Zealand and Sweden. Mortality in 6-11 month olds significantly decreased across all studied nations.

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Area of Science:

  • Pediatrics
  • Epidemiology
  • Public Health

Background:

  • Infant mortality trends and causes require ongoing surveillance.
  • Sudden Infant Death Syndrome (SIDS) is a significant concern in early infancy.
  • International comparisons are crucial for understanding demographic health patterns.

Purpose of the Study:

  • To analyze trends in infant mortality for two distinct age groups (1-5 months and 6-11 months) between 1966 and 1987.
  • To compare mortality rates across Australia, Canada, England and Wales, New Zealand, and Sweden.
  • To investigate the impact and trends of Sudden Infant Death Syndrome (SIDS) within these populations.

Main Methods:

  • Retrospective analysis of national mortality data from 1966 to 1987.
  • Stratification of mortality rates by age groups (1-5 months and 6-11 months).
  • Examination of reported causes of death, specifically focusing on SIDS and respiratory diseases.

Main Results:

  • Mortality rates for infants aged 1-5 months showed significant international variation, with Sweden having the lowest rates.
  • While rates decreased in Australia, Canada, and England/Wales, they increased in New Zealand and Sweden.
  • Reported SIDS mortality dramatically increased across all countries, likely influenced by diagnostic shifts from respiratory causes; SIDS accounted for approximately half of deaths in the 1-5 month group.

Conclusions:

  • A genuine increase in SIDS incidence is suggested for New Zealand and Sweden, and potentially other nations.
  • Total mortality in the 1-5 month age group served as an indirect indicator of SIDS mortality in developed countries.
  • Mortality rates for infants aged 6-11 months experienced a substantial reduction, approximately halving across all examined countries during the study period.

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