Table 4.

Factors associated with OS and BCSS in a modified Cox proportional hazards model of patients diagnosed with early breast cancer in 2018, 2019, and 2020.

Characteristics		OS				BCSS
		95% CI				95% CI
		HR	Low	High	P	HR	Low	High	P
Race
	White	Reference				Reference
	Black	1.381	1.207	1.58	<0.001	1.33	1.093	1.618	0.004
	Other	0.683	0.561	0.833	<0.001	0.719	0.535	0.966	0.028
Age
	<50	Reference				Reference
	50≤;<70	2.032	1.675	2.464	<0.001	1.443	1.13	1.842	0.003
	≥70	5.251	4.338	6.357	<0.001	3.443	2.693	4.401	<0.001
Grade
	I	Reference				Reference
	II	1.185	1.004	1.397	0.045	1.766	1.215	2.565	0.003
	III	1.557	1.294	1.875	<0.001	2.666	1.814	3.919	<0.001
Subtype
	HR+/Her2-	Reference				Reference
	HR+/Her2+	1.326	1.105	1.592	0.002	0.987	0.729	1.337	0.933
	HR-/Her2+	1.365	1.089	1.712	0.007	1.107	0.797	1.538	0.544
	HR-/Her2-	1.555	1.345	1.799	<0.001	1.544	1.269	1.88	<0.001
Stage
	I	Reference				Reference
	II	2.48	2.145	2.868	<0.001	4.729	3.687	6.066	<0.001
	III	6.789	5.894	7.819	<0.001	18.161	14.376	22.942	<0.001
Radiation
	No	Reference				Reference
	Yes	0.199	0.175	0.225	<0.001	0.191	0.158	0.231	<0.001
Chemotherapy
	No	Reference				Reference
	Yes	0.772	0.678	0.879	<0.001	0.943	0.78	1.141	0.546
Year of diagnosis
	2020	Reference				Reference
	2018	0.842	0.723	0.981	0.027	0.945	0.74	1.208	0.652
	2019	0.912	0.786	1.06	0.231	1.055	0.83	1.341	0.663