Cox proportional hazards models for UPPSALA estrogen receptor-negative older (>60) and younger (<60) women.

Upper model: UPPSALA estrogen receptor-negative, older women (>60 years of age) n = 20, 3 Breast Cancer Specific Survival events censored @ 5 years. Lower model: UPPSALA estrogen receptor-negative, younger women (<60 years of age) n = 10, 1 Breast Cancer Specific Survival event censored @ 5 years.上层模型：乌普萨拉（UPPSALA）雌激素受体阴性（estrogen receptor-negative）老年女性群体（年龄＞60岁），样本量n=20，5年截尾的乳腺癌特异性生存（Breast Cancer Specific Survival）事件共3例。 下层模型：乌普萨拉（UPPSALA）雌激素受体阴性（estrogen receptor-negative）年轻女性群体（年龄＜60岁），样本量n=10，5年截尾的乳腺癌特异性生存（Breast Cancer Specific Survival）事件共1例。