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Effects of chorion type on genetic and environmental influences on height, weight, and body mass index in South Korean young twins.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hur, Yoon-Mi Shin, Jung-Sik
Spatial Coverage	Korea
Description	Country affiliation: South Korea Author Affiliation: Hur YM ( Department of Psychology, Chonnam National University, Gwangju, South Korea.)
Abstract	The present study examined the effects of chorionicity of twins on variations of height, weight, and body mass index (BMI) during childhood in the classical twin design. Mothers of 81 pairs of monochorionic monozygotic (MCMZ), 47 pairs of dichorionic monozygotic (DCMZ), and 457 pairs of dizygotic (DZ) twins drawn from the South Korean Twin Registry reported their children's height and weight. Twins' age ranged from 1.9 to 8.7 yrs, with a mean of 4.0 yrs and SD of 1.7 yrs. We computed maximum likelihood twin correlations and performed model-fitting analyses. In correlational and model-fitting analyses, we treated age and sex as covariates to control their main effects. Maximum likelihood MCMZ, DCMZ, and DZ twin correlations were, respectively, .96, .92, and .74, for height, .88, .91, and .57 for weight, and .93, .92, and .61 for BMI. The pattern of these twin correlations suggested very modest chorion effects on body measures. Model-fitting analyses confirmed the observations from twin correlations. Whereas genetic and shared environmental influences were significant for all three body measures, chorion effects attained statistical significance only for height (4%), and those for weight and BMI were zero. These findings indicate that genetic and environmental estimates for height, weight, and BMI during childhood are biased little by the chorion type of MZ twins, supporting the validity of the equal prenatal environment assumption in the classical twin design.
File Format	HTM / HTML
ISSN	18324274
Issue Number	1
Volume Number	11
e-ISSN	18392628
Journal	Twin Research and Human Genetics
Language	English
Publisher	Cambridge University Press
Publisher Date	2008-02-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Genetics Body Height Body Mass Index Body Weight Chorion Anatomy & Histology Environment Asian Continental Ancestry Group Genetics Child Child, Preschool Female Humans Infant Korea Likelihood Functions Male Quantitative Trait, Heritable Twins, Dizygotic Twins, Monozygotic Journal Article Research Support, Non-u.s. Gov't Twin Study
Content Type	Text
Resource Type	Article
Subject	Genetics (clinical) Pediatrics, Perinatology and Child Health Obstetrics and Gynecology

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