Longitudinal analysis of the genetic and environmental influences on components of cognitive delay in preschoolers
The etiology of verbal and performance delays were investigated in a large population sample of twins at 2 and 3 years (N = 2,449 pairs). These data replicate and extend earlier analyses at 2 years (T. C. Eley et al., 1999). Several ways of defining delay were compared, selecting from the lowest 5%...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Psychological Association
2001
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