title: Genetic and environmental influences on reading achievement: a study of first- and second-grade twin children.
mesh_terms: D000124:Achievement; D000367:Age Factors; D001307:Auditory Perception; D002648:Child; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D011247:Pregnancy; D011581:Psychological Tests; D011932:Reading; D012737:Sex Factors; D012931:Social Environment; D014427:Twins / Q000523:psychology*; D014429:Twins, Dizygotic / Q000523:psychology*; D014430:Twins, Monozygotic / Q000523:psychology*; D014796:Visual Perception