Supplement to Boyd NF et al. Heritability of Mammographic Density, a Risk Factor for Breast Cancer. N Engl J Med 2002;347:886-94.

Supplementary Appendix 1

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Table 1. Estimates of Residual Variance, Covariances for Monozygotic and Dizygotic Twins, Correlations between Monozygotic and Dizygotic Twins, Heritability, and Regression Coefficients for the Effects of Measured Covariates on the Mean Percentage of Dense Tissue.

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Table 2. Estimates of Components of Variance for Residual Percentage of Dense Tissue.

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