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Stuttering and Tics in Twins

Published online by Cambridge University Press:  01 August 2014

U. Godai ,
R. Tatarelli  and
G. Bonanni
U. Godai
Affiliation:
The Gregor Mendel Institute of Medical Genetics and Twin Studies, Rome, Italy Department of Psychiatry, Second Chair, University of Rome, Italy
R. Tatarelli*
Affiliation:
The Gregor Mendel Institute of Medical Genetics and Twin Studies, Rome, Italy Department of Psychiatry, Second Chair, University of Rome, Italy
G. Bonanni
Affiliation:
The Gregor Mendel Institute of Medical Genetics and Twin Studies, Rome, Italy Department of Psychiatry, Second Chair, University of Rome, Italy
*
Istituto Mendel, Piazza Galeno 5, 00161 Roma, Italy

Abstract

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A total of 63 twin pairs (22 MZ and 41 DZ), with one or both members affected by not organic stuttering and/or tics, have been drawn out of the Mendel Institute's twin file. Concordance of stuttering was observed in 10:12 MZ, but only in 2:19 DZ twin pairs; concordance of tics in 6:10 MZ and in 2:22 DZ twin pairs. Stuttering did not come out significantly associated either with other disturbances of language or with an IQ under the average; almost always it was possible to find out a precipitating factor. Significant relations between stuttering and tics could not be stated. Sex ratio, obtained regarding any affected subject separately, clearly turned in favour of males both in stuttering (32:12) and in tics (27:12). Stutterers and left-handers incidence in the families of stuttering subjects appeared significant in comparison with families of subjects with tics.

Type
9. Science For Twins/Twins For Science
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 25 , Issue 1 , January 1976 , pp. 369 - 375
Copyright
Copyright © The International Society for Twin Studies 1976

References

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