|
|
| PMID |
|
|
| 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 |
|
|
| 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 |
|
|
|
