A genome-wide linkage study of mammographic density, a risk factor for breast cancer

Breast Cancer Research

Table 4 Estimates of heritability from SOLAR (standard error)

	Number of families	PMD_res	DA_res	NDA_res
All families	1,415	0.50 (0.045)	0.50 (0.044)	0.60 (0.043)
Families from Australia	659	0.43 (0.064)	0.43 (0.062)	0.62 (0.063)
Families from Northern California	257	0.50 (0.108)	0.56 (0.105)	0.50 (0.102)
Families from Ontario	499	0.56 (0.075)	0.54 (0.076)	0.60 (0.074)

PMD_res, DA_res and NDA_res are residuals from linear models adjusting the square root of PMD, quantile-normalized dense area, and log non-dense area, respectively, for covariates known to affect MD. MD, mammographic density; PMD percent mammographic density.

ISSN: 1465-542X