Chunk #10 — Method — Sample

Source

Genes of experience: explaining the heritability of putative environmental variables through their association with behavioural and emotional traits.

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Text

Analyses included 150 male MZ twin pairs, 178 female MZ twin pairs, 133 male DZ twin pairs, 178 female DZ twin pairs, and 463 opposite-sex DZ pairs. Sixty-nine percent of the sample was female, the mean age of the sample was 14.58 years old (range 13–17, SD = 1.36).