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From a representative sample of 3,886 twins (1,314 monozygotic, 1,296 dizygotic same-gender, and 1,276 dizogytic opposite-gender), the lowest 5% with regard to selected cognitive skills (sampled at 2, 3, and 4 years of age and then averaged) were selected by investigators from the United Kingdom and Germany. The 5% cutoff identified 73 monozygotic, 53 same-gender dizygotic, and 55 opposite- gender dizygotic twins (N=181). The …
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