Behavior Genetics

, Volume 24, Issue 5, pp 469–475 | Cite as

Type A personality in Australian twins

  • David L. DuffyEmail author
  • Vijaya Manicavasagar
  • Dianne O'Connell
  • Derrick Silove
  • Chris Tennant
  • Pauline Langelludecke


We examined the genetic and environmental determinants of Type A behavior in 200 pairs of same-sex twins as measured by the structured interview (SI) of Rosenman and Friedman and by the Bortner questionnaire (BARS). As noted previously, these measures are poorly correlated (r=.30). Quite different heritabilities were found for the two measures (63% for SI, 23% for BARS), and the correlation between the two was found to be largely genetic. Although the sample size meant that differences in correlation between MZ and DZ twins on the BARS were not significant in univariate analyses, they were suggestive of twin competition effects, as other twin studies have found. We conclude that further genetic analyses should concentrate on component behaviors rather than the overall Type A construct.

Key words

Type A personality twins Australia structured interview Bortner questionnaire 


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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • David L. Duffy
    • 1
    Email author
  • Vijaya Manicavasagar
    • 2
  • Dianne O'Connell
    • 3
  • Derrick Silove
    • 2
  • Chris Tennant
    • 4
  • Pauline Langelludecke
    • 4
  1. 1.Epidemiology UnitQueensland Institute of Medical ResearchBrisbaneAustralia
  2. 2.Academic Mental Health Unit, School of Psychiatry, University of New South Wales Professorial UnitLiverpool HospitalSydneyAustralia
  3. 3.Centre for Clinical Epidemiology and BiostatisticsUniversity of NewcastleNewcastleAustralia
  4. 4.Department of PsychiatryUniversity of SydneySydneyAustralia

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