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For all three hearing traits—pure tone thresholds (A), otoacoustic emission reproducibility (B), and otoacoustic emission strength (C)—cross-twin correlations were higher in MZ than in DZ twins, and very high heritability values could be estimated. r, intra-class correlation; h2, heritability estimate; 95% confidence interval in brackets; AE, preferred model used to estimate heritability.
