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. 2015 Sep 30;107(12):djv278. doi: 10.1093/jnci/djv278

Table 2.

Likelihood of receiving > 15 fractions of radiation therapy among clinical stage IV non–small cell lung cancer patients, National Cancer Database 2004–2012*

Categories OR (95% CI) P
Clinical factors
Sex .686
Male 1.0 (Ref)
Female 1.008 (0.97 to 1.05)
Comorbidity Index <.001
0 1.0 (Ref)
1 .867 (0.83 to 0.91)
≥2 .804 (0.76 to 0.86)
Age at diagnosis, y <.001
18–59 1.0 (Ref)
60–69 .922 (0.88 to 0.97)
70–79 .820 (0.77 to 0.87)
80+ .654 (0.61 to 0.7)
Histology <.001
Squamous 1.0 (Ref)
Nonsquamous .812 (0.78 to 0.85)
Size of primary tumor, cm <.001
0–6.5 1.0 (Ref)
6.6–18 .889 (0.85 to 0.93)
Unknown .674 (0.65 to 0.71)
Socioeconomic factors
Race/ethnicity <.001
Nonwhite 1.0 (Ref)
White 1.118 (1.06 to 1.17)
Insurance status <.001
Not insured 1.0 (Ref)
Private insurance/managed Care 1.401 (1.28 to 1.53)
Medicaid 1.050 (0.95 to 1.17)
Medicare 1.293 (1.18 to 1.42)
Other government .904 (0.77 to 1.07)
Institutional factors
Facility type <.001
Academic research program 1.0 (Ref)
Community cancer program 1.490 (1.38 to 1.58)
Comprehensive community cancer program 1.290 (1.18 to 1.42)
Facility volume <.001
High (>7.89 cases/y) 1.0 (Ref)
Medium (4.34–7.88 cases/y) 1.142 (1.09 to 1.19)
Low (0–4.33 cases/y) 1.241 (1.18 to 1.30)
Year of diagnosis <.001
2004–2008 1.0 (Ref)
2009–2012 .725 (0.7 to 0.75)

* CI = confidence interval; OR = odds ratio.