alexa A twin study of autism in Denmark, Finland, Iceland, Norway and Sweden.
Psychiatry

Psychiatry

Journal of Psychiatry

Author(s): Steffenburg S, Gillberg C, Hellgren L, Andersson L, Gillberg IC,

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Abstract The Nordic countries were screened for the occurrence of cases of autism with a same-sexed twin under age 25 years. Twenty-one pairs (11 monozygotic and 10 dizygotic) of twins and one set of identical triplets were found and extensively examined. The concordance for autism by pair was 91\% in the monoygotic and 0\% in the dizygotic pairs. The corresponding concordances for cognitive disorder were 91\% and 30\%, respectively. In most of the pairs discordant for autism, the autistic twin had more perinatal stress. The results lend support for the notion that autism sometimes has a hereditary component and that perinatal stress is involved in some cases.
This article was published in J Child Psychol Psychiatry and referenced in Journal of Psychiatry

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