Table 2.

Demographic, Provider, and Clinical Factors Associated With Use of RT

Predictor	% of Patients Who Received RT	Unadjusted			Adjusted
		OR	95% CI	P	OR	95% CI	P
Age at diagnosis, years				< .001			.003
21-54	61	Reference			Reference
55-69	56	0.81	0.57 to 1.14		0.89	0.62 to 1.28
70-79	49	0.61	0.44 to 0.85		0.63	0.41 to 0.95
80+	39	0.42	0.30 to 0.59		0.47	0.30 to 0.73
Sex				.63			.93
Male	50	Reference			Reference
Female	49	0.95	0.77 to 1.17		0.99	0.78 to 1.25
Marital status				.02			.13
Married/living as married	52	Reference			Reference
Not married	46	0.78	0.64 to 0.96		0.84	0.67 to 1.05
Race				.20			.29
White	49	Reference			Reference
Hispanic/Latino	53	1.18	0.73 to 1.88		1.10	0.67 to 1.79
African American	48	0.96	0.72 to 1.29		0.93	0.68 to 1.28
Asian/Pacific Islander	53	1.17	0.74 to 1.85		1.01	0.62 to 1.63
Other	63	1.76	1.08 to 2.87		1.75	1.04 to 2.94
Insurance				.04			.65
Medicare	49	Reference			Reference
Medicaid	47	0.95	0.64 to 1.42		0.80	0.52 to 1.23
Medicare plus private	45	0.88	0.65 to 1.18		0.81	0.59 to 1.12
Private	55	1.30	0.95 to 1.78		0.75	0.50 to 1.12
Other	54	1.21	0.85 to 1.74		0.81	0.52 to 1.25
Comorbidity score				.14			.34
None	49	Reference			Reference
Mild	53	1.19	0.91 to 1.57		1.23	0.92 to 1.64
Moderate	48	0.96	0.71 to 1.30		1.04	0.75 to 1.44
Severe	46	0.89	0.65 to 1.20		0.99	0.71 to 1.38
Chemotherapy after metastasis				< .001			< .001
No	42	Reference			Reference
Yes	56	1.77	1.45 to 2.16		1.66	1.34 to 2.05
Primary lung cancer–directed surgery after metastasis				.006			< .001
No	50	Reference			Reference
Yes	36	0.55	0.36 to 0.84		0.41	0.26 to 0.63
Metastatic site surgery				.003			.006
No	49	Reference			Reference
Yes	65	1.96	1.27 to 3.02		1.90	1.20 to 3.00
Integrated network				.02			.07
No	52	Reference			Reference
Yes	46	0.79	0.65 to 0.96		0.82	0.66 to 1.02

Abbreviations: OR, odds ratio; RT, radiation therapy.