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Intraclass correlations (ICCs) and their 95% confidence intervals for mathematics and reading achievement in Dutch twin pairs across the same grades (3–8) as reported by Figlio et al. (1). ICCs for same-sex (SS) male (SS-M), SS female (SS-F), and opposite-sex (OS) twin pairs (A) and ICCs for monozygotic (MZ) male (MZ-M), dizygotic (DZ) male (DZ-M), MZ female (MZ-F), DZ female (DZ-F), and OS twin pairs (B) are given. For each ICC, the number of twin pairs is between 100 and 300.
