. Author manuscript; available in PMC: 2020 Jul 1.

Published in final edited form as: Breast J. 2019 May 13;25(4):644–653. doi: 10.1111/tbj.13296

Table 5:

Association with Survival - Propensity Score Matched Sample

	Local Surgery	N	Hazard Ratio (95% CI)	HR P-value

Surgery at Primary Site (Regardless of Systemic Therapy)	Yes	2867	0.68 (0.63–0.72)	<.001
Surgery at Primary Site (Regardless of Systemic Therapy)	No	2867	-	-

Surgery at Primary Site (Systemic Therapy)	Yes	2380	0.66 (0.62–0.71)	<.001
Surgery at Primary Site (Systemic Therapy)	No	2380	-	-

Surgery at Primary Site (No Systemic Therapy)	Yes	414	0.54 (0.47–0.63)	<.001
Surgery at Primary Site (No Systemic Therapy)	No	414	-	-

^•

After propensity score matching, the study cohorts are balance among below variables: Race, Charlson-Deyo Score, Facility Location, Facility Type, Primary Payor, median income, grade, analytic T and N stage, ER, PR, Systemic Therapy, Radiation therapy, Tumor size (quartile), and age.