American Journal of Epidemiology, Vol 152, Issue 8 704-715, Copyright © 2000 by Oxford University Press
SB Harrap, M Stebbing, JL Hopper, HN Hoang and GG Giles
The Victorian Family Heart Study was established to address the causes of
familial patterns in cardiovascular risk factors. From 1990 to 1996, a
representative population sample of 783 adult families (2,959 individuals),
each comprising both parents (40-70 years) and at least one natural adult
offspring (18-30 years), was recruited in Melbourne, Australia. Included in
both generations were 461 monozygotic and dizygotic twins as pairs or
singletons. A multivariate normal model was used for pedigree analysis of
height, weight, body mass index, diastolic and systolic blood pressure,
pulse rate, and total and high density lipoprotein cholesterol. All traits
showed evidence for additive genetic variation, explaining from 55%
(height) to 26% (pulse) of age- and sex-adjusted variance. An effect
persisting into adulthood of shared family environment during cohabitation
explained from 39% (body mass index) to 13% (systolic blood pressure) of
variance (not nominally significant for diastolic blood pressure). These
shared environmental effects were strongest within twin pairs, less so for
sibling pairs, and least for parent-offspring pairs (in which an effect was
not observed for weight, diastolic and systolic blood pressure, and total
cholesterol). On a background of genetic influences, there are periods in
early life during which the family environment cements long- term
correlations between adult relatives in cardiovascular risk factors.
Familial patterns of covariation for cardiovascular risk factors in adults: The Victorian Family Heart Study [In Process Citation]
Department of Physiology, University of Melbourne, Parkville, Victoria, Australia. s.harrap@physiology.unimelb.edu.au
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