Genetic and environmental influence on language impairment in 4-year-old same-sex and opposite-sex twins
Background: We investigated the aetiology of language impairment in 579 four year-old twins with low language performance and their co-twins, members of 160 MZ twin pairs, 131 same-sex DZ pairs and 102 opposite-sex DZ pairs. Methods: Language impairment in 4-year-olds was defined by scores below the...
| Main Authors: | , , , , , |
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| 格式: | Journal article |
| 语言: | English |
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Blackwell Publishers
2004
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