Table 5.

Multivariate Cox proportional hazards model to examine the effect of demographics, tumor features, health insurance and treatment delay

Variable		Hazard ratio	P-value	90% Confidence Intervals
Age	<45	Ref.	Ref.	Ref.	Ref.
	45-64	0.32	0.26	0.06	1.66
	>65	0.08	0.07	0.01	0.78
Tumor stage	III	Ref.	Ref.	Ref.	Ref.
	IV	2.45	0.11	0.98	6.14
Health insurance	Private	Ref.	Ref.	Ref.	Ref.
	Medicaid/Medicare-Medicaid	2.30	0.26	0.69	7.64
	Medicare	7.54	0.07	1.25	45.59
Tumor receptor subtypes	ER+/PR+	Ref.	Ref.	Ref.	Ref.
	ER-/PR-	6.21	0.01	2.10	18.34
	Not done/ Unknown	7.14	0.19	1.80	28.31
Treatment Delay	15-44	Ref.	Ref.	Ref.	Ref.
	<15	6.69	0.08	1.16	38.73
	≥45	4.48	0.08	1.10	18.23

Ref. = variables for which the model was adjusted.

Variables with significant p values are in boldface.

*Not done/ Unknown= the patient died before the test could be performed and unknown tumor receptor subtypes.