Table 2.

Multivariable Cox proportional hazards model

	HR	95% CI	P-value
Stage (per stage increment)	2.15	1.61–2.89	3.05E-07
Age (per 1-yr increment)	1.04	1.02–1.05	2.48E-06
AI treatment (vs. no AI treatment)	0.61	0.40–0.94	0.026

Multivariable Cox proportional hazards model for clinical variables (ER+/HER2- cohort). HR hazard ratio, CI confidence interval, AI aromatase inhibitor