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.