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Asbury, Kathryn; Dunn, Judith F.; Plomin, Robert – Developmental Science, 2006
This longitudinal monozygotic (MZ) twin differences study explored associations between birthweight and early family environment and teacher-rated behaviour problems and academic achievement at age 7. MZ differences in anxiety, hyperactivity, conduct problems, peer problems and academic achievement correlated significantly with MZ differences in…
Descriptors: Behavior Problems, Academic Achievement, Hyperactivity, Effect Size