Univariate and multivariable adjusted hazard ratios of covariates for all-cause mortality.

Abbreviations: OP = operation; CT = chemotherapy; RT = radiation therapy; CCI = Charlson Comorbidity Index; NTD = New Taiwan Dollar; HT = hormonal therapy; AIs = aromatase inhibitors.aHazard ratios (95% confident interval) were adjusted for all listed variables in the table as well as residential areas of NHI divisions, year of HT initiation, HT prescription duration and time-dependent covariates.bThe income-related insurance payment category set by the Bureau of National Health Insurance in Taiwan.c1 NTD = 0.03 USD in 2012.