Genetic Epidemiology, Translational Neurogenomics, Psychiatric Genetics and Statistical Genetics Laboratories investigate the pattern of disease in families, particularly identical and non-identical twins, to assess the relative importance of genes and environment in a variety of important health problems.
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PMID
18179396
TITLE
An investigation of a measure of twins' equal environments.
ABSTRACT
The equal environments assumption, which holds that trait-relevant environments are equally correlated among monozygotic (MZ) and dizygotic (DZ) twin pairs, is essential to twin designs. Violations of this assumption could lead to biased parameter estimates in twin models. A variety of methods and measures have been used to test this assumption. No studies to date have evaluated the measurement invariance of such items or examined the distribution of the underlying equal environments trait. The current study was an investigation of the psychometric properties of a self-report measure of twins' equal environments. Exploratory and confirmatory factor analysis results indicated that items loaded onto 'child' and 'teen' equal environments factors. Factor loadings and factor variances and their covariance were invariant for MZ and DZ twins; however, DZ twins had significantly lower factor means than MZ twins. Further, these items demonstrated adequate test-retest reliability. Lastly, the child and teen factors may be bimodally distributed, particularly for MZ twin pairs. Measurement invariance issues, as well as distributions of equal environments traits, should be considered when evaluating the equal environments assumption, in order to produce accurate parameter estimates in twin models.
DATE PUBLISHED
2007 Dec
HISTORY
PUBSTATUS PUBSTATUSDATE
pubmed 2008/01/09 09:00
medline 2008/02/02 09:00
entrez 2008/01/09 09:00
AUTHORS
NAME COLLECTIVENAME LASTNAME FORENAME INITIALS AFFILIATION AFFILIATIONINFO
Mitchell KS Mitchell Karen S KS Department of Psychology, Virginia Commonwealth University, Richmond, VA 23284-2018, USA. s2ksmitc@vcu.edu
Mazzeo SE Mazzeo Suzanne E SE
Bulik CM Bulik Cynthia M CM
Aggen SH Aggen Steven H SH
Kendler KS Kendler Kenneth S KS
Neale MC Neale Michael C MC
INVESTIGATORS
JOURNAL
VOLUME: 10
ISSUE: 6
TITLE: Twin research and human genetics : the official journal of the International Society for Twin Studies
ISOABBREVIATION: Twin Res Hum Genet
YEAR: 2007
MONTH: Dec
DAY:
MEDLINEDATE:
SEASON:
CITEDMEDIUM: Print
ISSN: 1832-4274
ISSNTYPE: Print
MEDLINE JOURNAL
MEDLINETA: Twin Res Hum Genet
COUNTRY: England
ISSNLINKING: 1832-4274
NLMUNIQUEID: 101244624
PUBLICATION TYPE
PUBLICATIONTYPE TEXT
Journal Article
Research Support, N.I.H., Extramural
Twin Study
COMMENTS AND CORRECTIONS
GRANTS
GRANTID AGENCY COUNTRY
K01 MH068520 NIMH NIH HHS United States
T32 MH20030 NIMH NIH HHS United States
K01 MH001553 NIMH NIH HHS United States
T32 MH020030 NIMH NIH HHS United States
K01 MH068520-02 NIMH NIH HHS United States
K01 MH068520-04 NIMH NIH HHS United States
R01 MH065322 NIMH NIH HHS United States
R01 MH049492 NIMH NIH HHS United States
R01 MH49492 NIMH NIH HHS United States
R01 MH65322 NIMH NIH HHS United States
R01 DA011287 NIDA NIH HHS United States
GENERAL NOTE
KEYWORDS
MESH HEADINGS
DESCRIPTORNAME QUALIFIERNAME
Adolescent
Child
Environment
Female
Humans
Models, Genetic
Models, Psychological
Parent-Child Relations
Registries
Twins, Dizygotic psychology
Twins, Monozygotic psychology
Virginia psychology
SUPPLEMENTARY MESH
GENE SYMBOLS
CHEMICALS
OTHER ID's