This Article  • References  • Full text PDF  • Reply to article  • Send to a friend  • Save in My Folder  • Save to citation manager  • Permissions  Citing Articles  • Contact me when this article is cited  Related Content  • Similar articles in this journal  Social Bookmarking   What's this?

Scott Lurie, MD; Pleas Geyer, MD
Carolinas Medical Center 501 Billingsley Rd Charlotte, NC 28211

Arch Gen Psychiatry. 1994;51(10):838.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

True et al,¹ in their twin study on genetic and environmental contributions to the liability for posttraumatic stress symptoms in Vietnam veterans, use a bivariate model to postulate significant genetic influences on symptom liability and state that there is no evidence that shared environment contributes to the development of posttraumatic stress symptoms.

This model is erroneous, however, since it is based on the assumption that noncombat environmental influences are not more highly correlated in monozygotic (MZ) twins than in dizygotic (DZ) twins. The authors' own data indicate that the MZ twins have a higher concordance for combat exposure than do DZ twins (0.34 vs 0.17). To assume that their environments previous to this are somehow no more concordant seems obviously false.

In addition, the fact that MZ twins are so much more alike in appearance, tend to play together, and have other childhood similarities, seems to guarantee that their . . . [Full Text PDF of this Article]

CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter     What's this?