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Twins Have Slightly Higher Self-Concepts Than Singletons in the Elementary School Period: A Study of South Korean Twins and Singletons

Published online by Cambridge University Press:  21 February 2012

Young-Soon Yoon  and
Yoon-Mi Hur
Young-Soon Yoon
Affiliation:
Hansung University, Seoul, South Korea.
Yoon-Mi Hur*
Affiliation:
The Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University, Seoul, South Korea. [email protected]
*
*Address for Correspondence: Yoon-Mi Hur,Medical Research Center #110, Seoul National University, Yongon-Dong, Chongro-Gu, Seoul, South Korea 110-460.

Abstract

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The twin method assumes that the trait under study is similar in twins and singletons so that the results from twin samples can be generalized to the singleton population. The purpose of the present study was to compare self-concept in twins and singletons matched in parental level of education. The 6 cluster scales of the Piers-Harris Children's Self-Concept Scale (P-H) were administered to 630 singleton children and 635 twins aged 7 to 12 years. Model-fitting analyses yielded two conclusions. First, self-concept was generally similar between first- and second-born twins and between monozygotic and dizygotic twins across the 6 cluster scales of the P-H. Second, twins consistently exceeded singletons for all 6 cluster scales of the P-H. However, the effect sizes of differences between twins and singletons were small except for one scale, Physical Appearance and Attributes.

Type
Articles
Information
Twin Research and Human Genetics , Volume 9 , Issue 2 , 01 April 2006 , pp. 233 - 239
Copyright
Copyright © Cambridge University Press 2006