Table 4.

Multivariate adjusted odds ratios for radiation therapy, SEER 2000–2010

	HR Subtype AOR (95 % CI)a	SES AOR (95 % CI)b	HCA AOR (95 % CI)c	Fully adjusted AOR (95 % CI)d
Race/ethnicity
NH-White (referent)	–	–	–	–
NH-Black	0.84 (0.82–0.85)	0.83 (0.81–0.85)	0.83 (0.81–0.84)	0.85 (0.83–0.87)
Hispanic	0.89 (0.87–0.91)	0.90 (0.88–0.92)	0.90 (0.88–0.92)	0.90 (0.90–0.92)
Age at diagnosis
40–44 (referent)	–	–	–	–
45–54	1.04 (1.02–1.07)	1.05 (1.02–1.07)	1.05 (1.02–1.07)	1.04 (1.02–1.07)
55–64	1.07 (1.05–1.10)	1.08 (1.06–1.11)	1.08 (1.05–1.11)	1.07 (1.05–1.10)
65–74	0.91 (0.89–0.94)	0.93 (0.91–0.95)	0.93 (0.90–0.95)	0.92 (0.89–0.94)
75+	0.47 (0.46–0.48)	0.48 (0.47–0.49)	0.48 (0.47–0.49)	0.47 (0.46–0.49)
Breast cancer hormone-receptor subtype
HR+ (referent)	–			–
HR−	0.84 (0.83–0.85)			0.84 (0.83–0.86)
County-level socio-economic status†
% Black population (SD = 13.24)		1.02 (1.01–1.03)		1.01 (1.00–1.02)
% Unemployed (SD = 2.20)		1.06 (1.05–1.08)		1.06 (1.05–1.08)
% Less than 9th grade education     (SD = 4.74)		0.98 (0.97–1.00)		0.99 (0.96–0.99)
% Families below poverty level     (SD = 4.75)		0.87 (0.85–0.89)		0.86 (0.85–0.88)
County-level healthcare access†
% No health insurance (SD = 4.68)			0.92 (0.91–0.93)	1.03 (1.01–1.05)
# Oncology hospitals per million (SD = 10.08)			0.99 (0.98–1.00)	0.99 (0.98–1.00)
# Medical doctors per million (SD = 520.55)			1.00 (0.99–1.02)	1.00 (0.99–1.02)
# OB GYN per million (SD = 70.47)			1.01 (1.00–1.03)	1.01 (1.00–1.03)

AOR adjusted odds ratios

Bold indicates significance p value ≤0.05

^aAdjusted for race, age, SEER registry, late-stage diagnosis, and HR subtype

^bAdjusted for race, age, SEER registry, late-stage diagnosis and county-level SES

^cAdjusted for race, age, SEER registry, late-stage diagnosis, and county-level HCA

^dAdjusted for race, age, SEER registry, late-stage diagnosis, HR subtype, and county-level SES and HCA

^†ORs associated with standard deviation increase