Univariate logistic regression analysis for the use of ET.

Notes:*Early breast cancers include stage 0, stage I, and stage II cancers;**Carcinomas in situ includes lobular and ductal carcinomas in situ, microinvasive carcinoma, and Paget's disease; ***Infiltrative non-specific cancers are invasive ductal and lobular carcinomas and mixed ductal carcinoma; ****Special carcinomas are tubular carcinoma, medullary carcinoma, and mucinous carcinoma.a:Northeast, Central, Northwest, and Southwest areas; b:Northern, Southern, and Eastern areas; c: junior high school and below:primary school, junior high school, and illiteracy;senior high school and above: senior high school, junior college, and above degree;d: business staff, manual workers, housewives, soldiers, and others.