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Related Experiment Videos

Deprenyl, excess mortality, and epidemiological traps

J E Riggs1

  • 1Department of Neurology, West Virginia University School of Medicine, Morgantown 26506, USA.

Clinical Neuropharmacology
|June 1, 1997
PubMed
Summary

A recent study on Parkinson's disease patients taking deprenyl reported higher mortality. This finding may be an epidemiological artifact due to variations in individual ages within groups, not a drug effect.

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Area of Science:

  • Epidemiology
  • Neurology
  • Clinical Research

Background:

  • Recent studies suggested a higher mortality risk in Parkinson's disease patients using deprenyl.
  • No clear biological mechanism explained this observed increased mortality.

Purpose of the Study:

  • To investigate a potential epidemiological explanation for the unexplained higher mortality in Parkinson's disease patients taking deprenyl.
  • To assess the validity of age-matched group comparisons in mortality studies.

Main Methods:

  • Modeled expected mortality over a 6-year period for four hypothetical age-matched groups.
  • Analyzed the impact of individual age variation within age-matched groups on expected mortality rates.

Main Results:

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  • Significant variation in expected group mortality was observed due to individual age differences within groups, despite overall age-matching.
  • This variation occurred without compromising the age-match comparability between groups.

    • Conclusions:

    • Mortality comparisons between age-matched groups can be invalidated by variations in individual ages.
    • The "epidemiological trap" of age variation within groups may explain the previously reported high mortality in Parkinson's disease patients taking deprenyl.