TABLE 3.

Multivariate analysis of predictors of receipt of RT in the last 12 months of life after metastatic cancer diagnosis for the entire cohort

Variable	Adjusted OR	95% CI	p value
Year of death
2000	1.00
2001	1.10	1.02–1.20	0.02
2002	1.03	0.94–1.11	0.49
2003	1.03	0.95–1.12	0.48
2004	1.08	1.00–1.17	0.07
2005	0.98	0.91–1.06	0.66
2006	1.00	0.92–1.09	0.96
2007	1.01	0.93–1.09	0.86
Age, years
65–69	1.00
70–74	0.88	0.82–0.91	<0.0001
75–79	0.70	0.66–0.74	<0.0001
80+	0.49	0.47–0.52	<0.0001
Race/Ethnicity
Non-Hispanic White	1.00
Non-Hispanic Black	0.88	0.82–0.95	0.0005
Hispanic	1.01	0.92–1.11	0.81
Other	1.00	0.91–1.10	0.99
Marital status
Married	1.00
Unmarried	0.73	0.69–0.77	<0.0001
Unknown	0.81	0.78–0.84	<0.0001
Cancer type
Breast	1.00
Colorectal	0.22	0.19–0.24	<0.0001
Lung	1.74	1.60–1.89	<0.0001
Pancreas	0.17	0.15–0.19	<0.0001
Prostate	1.36	1.22–1.53	<0.0001
Comorbidity score
0	1.00
1	0.84	0.80–0.87	<0.0001
2+	0.63	0.60–0.66	<0.0001
SEER region
Midwest	1.00
Northeast	1.07	1.00–1.15	0.05
South	1.14	1.07–1.22	<0.0001
West/Hawaii	1.02	0.96–1.08	0.58
Median income in census tract
Lowest quartile	1.00
Second quartile	1.07	1.01–1.11	0.02
Third quartile	1.09	1.02–1.13	0.01
Highest quartile	1.14	1.06–1.19	<0.0001
Unknown	1.06	0.97–1.16	0.21
Radiation Oncologists per 100,000
0	1.00
1–3	0.96	0.90–1.02	0.15
4–24	1.07	1.01–1.13	0.03
25–147	1.06	1.00–1.12	0.05
Hospice
No	1.00
Yes	1.35	1.30–1.40	<0.0001

Gender, educational level and urban versus rural residence did not reach significance in the adjusted model and thus results for these variables are not shown here.