Document Detail

Effects of placentation on selected Type A behaviors in adult males in the National Heart, Lung, and Blood Institute (NHLBI) twin study.
MedLine Citation:
PMID:  2018465     Owner:  NLM     Status:  MEDLINE    
A dermatoglyphic index derived from monozygotic (MZ) twins of known placental type was used to estimate placentation retrospectively in a sample of adult male MZ twins. Examination of behavioral test scores with respect to placentation showed that the within-pair difference of most measures of type A behavior was smaller in presumed monochorionic than presumed dichorionic pairs. Measures of cognitive function and hostility were not related to placental type. Intraclass correlations in the monochorionic subgroup of MZ twins were greater than the correlations reported for the full sample of MZ twins. The trends were strongest for the Adjective Check List scales taken at two different exams 5 years apart and, to a lesser extent, for the Framingham type A scale. Our results are most consistent with greater intrauterine environmental covariance in monochorionic MZ twins as an explanation for inflation of the MZ twin correlation relative to dizygotic (DZ) correlation reported for some type A measures.
T Reed; D Carmelli; R H Rosenman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Behavior genetics     Volume:  21     ISSN:  0001-8244     ISO Abbreviation:  Behav. Genet.     Publication Date:  1991 Jan 
Date Detail:
Created Date:  1991-05-23     Completed Date:  1991-05-23     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0251711     Medline TA:  Behav Genet     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  9-19     Citation Subset:  IM    
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis 46202.
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MeSH Terms
Longitudinal Studies
Placentation / genetics*
Social Environment
Twins, Dizygotic / genetics*
Twins, Monozygotic / genetics*,  psychology
Type A Personality*

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