Familial Aspects of Mammographic Density Measures Associated with Breast Cancer Risk.

Model 4 constrains the MZ pair correlation to be twice the correlation for DZ and sister pairs combined, and the comparison of the log-likelihoods with those of Model 2 shows that, except for Cirrocumulus , there was at least nominally significant evidence that the MZ correlations were more than twice the corresponding correlations for DZ and sister pairs combined (all p ≤ 0.05).

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Model 3 constrains all pair correlations to be the same, and comparisons of the log-likelihoods with those of Model 1 show that there is highly significant evidence that this model is not consistent with the data; a similar statement applies to comparisons with Model 2.

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