The two exceptions were (a) the reading comprehension composite at age 12, for which the model parameters suggested a marginally significant, but very small, quantitative sex-difference; and (b) reading fluency at age 7, for which there were small significant differences between the sexes in phenotypic variance, but no evidence of genetic differences.
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The genetic architecture of oral language, reading fluency, and reading comprehension: A twin study from 7 to 16 years.
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