MGD, BP echo, and BPE were dichotomized for statistical analyses. MGD was divided as nondense (grade 1, 2) and dense (grade 3, 4). BP echo was divided as homogeneous and heterogeneous. BPE on MR was also divided as nondense (grade 1, 2) and dense (grade 3, 4). Fisher's exact test was used to compare BP echo with MGD grades and BPE grades separately according to the menopausal status. Statistical analysis was performed by SPSS software (version 21.0; Chicago, IL). Statistical significant was assigned if the P-value was <.05.
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