Average percent-methylation in leukocyte and mammary tissue DNA from women with benign breast disease and invasive breast cancer.

N corresponds to the number of samples for which methylation values are available for both blood and mammary tissue. Values are means ± standard deviations. Spearman's ρ was calculated excluding pairs with unknown values.

N代表同时拥有血液与乳腺组织甲基化值的样本数量。数据以平均值±标准差表示。计算斯皮尔曼秩相关系数（Spearman's ρ）时，已剔除存在未知值的样本对。