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Left-handedness and mortality

M E Salive1, J M Guralnik, R J Glynn

  • 1Epidemiology, Demography and Biometry Program, National Institute on Aging, National Institutes of Health, Bethesda, MD 20892.

American Journal of Public Health
|February 1, 1993
PubMed
Summary
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This study found no link between left-handedness and mortality. Age distribution, not handedness, explains lower average age at death in left-handed individuals.

Area of Science:

  • Gerontology
  • Epidemiology
  • Human Biology

Background:

  • Previous research suggested left-handedness is associated with higher mortality.
  • This association was often based on lower average age at death for left-handed individuals.

Purpose of the Study:

  • To investigate the relationship between handedness and mortality.
  • To determine if left-handedness is an independent risk factor for mortality.

Main Methods:

  • A simulation using national data to analyze age distribution and mortality.
  • A 6-year cohort study of 3774 older adults in East Boston, Massachusetts.

Main Results:

  • The simulation demonstrated that age distribution exclusively explains lower mean age at death among left-handed persons.

Related Experiment Videos

  • The cohort study found no statistically significant association between left-handedness and mortality (relative odds = 1.04, 95% CI = 0.79–1.36).

    • Conclusions:

    • Left-handedness is not associated with increased mortality in older adults.
    • Observed differences in age at death are attributable to demographic factors, not inherent mortality risks of left-handedness.