Multivariate logistic regression analysis of associations between BMI and breast cancer receptor status^a.

ER = estrogen receptor; PR = progesterone receptor; HER2 = human epidermal growth factor type 2 receptor; OR = odds ratio; CI = confidence interval; apresents “BMI<24 kg/m2” as the reference group; bage at diagnosis, age at menopause, age at first delivery, number of live births, the history of breast feeding, the family history of breast cancer, pathologic type, tumor size, LNM status, ER status, PR status, and HER2 status of breast cancer were involved in multiple forward stepwise logistic regression models with entry and exit criteria of P = 0.05 and P = 0.10; ER status, PR status, and HER2 status weren’t involved in a model twice at the same time.