Self-report psychiatric symptoms in twins and their nontwin relatives: Are twins different?

While twin studies of psychiatric disorders have been conducted for over 65 years, surprisingly little is known about the comparability of psychiatric symptoms in adult twins and singletons. To address this question, we compared the means and variances of four‐factor scores on the self‐report Sympto...

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Veröffentlicht in:American journal of medical genetics 1995-12, Vol.60 (6), p.588-591
Hauptverfasser: Kendler, Kenneth S., Martin, Nicholas G., Heath, Andrew C., Eaves, Lindon J.
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container_title American journal of medical genetics
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creator Kendler, Kenneth S.
Martin, Nicholas G.
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Eaves, Lindon J.
description While twin studies of psychiatric disorders have been conducted for over 65 years, surprisingly little is known about the comparability of psychiatric symptoms in adult twins and singletons. To address this question, we compared the means and variances of four‐factor scores on the self‐report Symptom Check List in twins and their relatives from the Virginia 30,000 twin‐family study. The four factors were depression, panic‐phobia, somatization, and insomnia. Twins had significantly higher scores on the panic‐phobia factor than their relatives, by about one eighteenth of a standard deviation, and this was replicated in both sub‐samples. However, no consistent and significant mean differences between twins and their relatives were detected for the other three symptom factors. While some differences in variance were found between twins and their relatives, in no case were the differences replicated in both subsamples. With the possible exception of modestly elevated scores for panic‐phobia, these results suggest that both the level and variability of common psychiatric symptoms reported by twins are similar to those found in the non‐twin population. © 1995 Wiley‐Liss, Inc.
doi_str_mv 10.1002/ajmg.1320600622
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subjects Adult and adolescent clinical studies
Age Factors
Analysis of Variance
anxiety
Anxiety disorders. Neuroses
Biological and medical sciences
Depression
Diseases in Twins - psychology
Female
Humans
Male
Medical sciences
Miscellaneous
Panic Disorder
Phobic Disorders
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Sex Factors
Sleep Initiation and Maintenance Disorders
Somatoform Disorders
twins
Twins - psychology
title Self-report psychiatric symptoms in twins and their nontwin relatives: Are twins different?
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