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Related Experiment Videos

Multiple sclerosis and birth order: a longitudinal cohort study.

A Dessa Sadovnick1, Irene M L Yee, George C Ebers

  • 1Department of Medical Genetics, University of British Columbia, Vancouver, Canada. sadovnik@infinet.net

The Lancet. Neurology
|September 20, 2005
PubMed
Summary
This summary is machine-generated.

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This study found no link between birth order and multiple sclerosis (MS) risk, challenging the hygiene hypothesis. Findings suggest older siblings do not protect against developing MS.

Area of Science:

  • Neurology
  • Epidemiology
  • Genetics

Background:

  • Multiple sclerosis (MS) is influenced by both genetic and environmental factors.
  • Environmental influences are suggested by geographical patterns, migration, and twin studies.
  • The hygiene hypothesis posits that early-life infections, potentially from older siblings, protect against MS.

Purpose of the Study:

  • To investigate the association between birth order and the risk of developing multiple sclerosis.
  • To evaluate the validity of the hygiene hypothesis in the context of MS etiology.

Main Methods:

  • Utilized a longitudinal, population-based sample from the Canadian Collaborative Project on Genetic Susceptibility to MS.
  • Analyzed data from individuals with MS and their healthy siblings, categorized by sibship size and MS status (simplex/multiplex).

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Main Results:

  • No overall association was found between birth order position and MS risk in 10,995 individuals with MS and 26,336 healthy siblings.
  • A slight, non-significant trend suggested later birth order in large sibships and first-born status in multiplex sibships might be associated with MS.
  • Individuals with MS were younger than their healthy siblings, contradicting expected age-of-onset bias.

Conclusions:

  • The study findings do not support the hygiene hypothesis regarding older siblings protecting against MS.
  • The observed trends may be attributed to cohort effects related to increasing MS incidence.
  • Birth order does not appear to be a significant risk factor for MS in most familial contexts.