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Defining discordance in twin studies of risk and protective factors for late life disorders

  • Margaret Gatz (a1), Nancy L Pedersen (a2), Michael Crowe (a3) and Amy Fiske (a4)

Abstract

In studies that employ matched pair analysis to identify environmental exposures important for a disorder, criteria for discordant pairs are seldom discussed. Yet several assumptions concerning the definition of discordancy may have considerable influence over what results are found. Problems are exacerbated when age of onset for a disorder is late in life. We propose a new set of criteria for defining discordant pairs in studies of dementia, taking into account duration of discordance and competing causes of mortality, and evaluate the consequences of choosing alternative definitions of discordancy. Twin Research (2000) 3, 159–164.

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Copyright

Corresponding author

*Correspondence: Dr Margaret Gatz, Department of Psychology, University of Southern California, 3620 McClintock, Los Angeles, California90089-1061, USA. Tel: 213 740 2212; Fax: 213 746 5994
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Twin Research and Human Genetics
  • ISSN: 1832-4274
  • EISSN: 1839-2628
  • URL: /core/journals/twin-research-and-human-genetics
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