Effects of placentation on selected type A behaviors in adult males in the national Heart, Lung, and Blood Institute (NHLBI) twin study

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...

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Bibliographic Details
Published in:Behavior genetics 1991, Vol.21 (1), p.9-19
Main Authors: REED, T, CARMELLI, D, ROSENMAN, R. H
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Classical genetics, quantitative genetics, hybrids
Female
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Human
Humans
Longitudinal Studies
Male
Placentation - genetics
Pregnancy
Social Environment
Twins, Dizygotic - genetics
Twins, Monozygotic - genetics
Twins, Monozygotic - psychology
Type A Personality
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Summary: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.
ISSN:0001-8244
1573-3297
DOI:10.1007/BF01067663