Table 3.
Multivariable Analysis of Overall Survival of Nonmetastatic Colon Cancer Patients Diagnosed 2010-2015 in the NCDB.
| Overall Survival (years from diagnosis) |
|||
|---|---|---|---|
| Covariate | Level | Hazard ratio (95% CI) | HR P-value |
| Medicaid expansion state | Yes | .99 (.95-1.03) | .570 |
| No | — | — | |
| Pathologic stage group | 3 | 3.80 (3.59-4.02) | <.001 |
| 2 | 1.85 (1.74-1.97) | <.001 | |
| 1 | — | — | |
| Median income quartiles 2008-2012 | < $38 000 | 1.21 (1.13-1.29) | <.001 |
| $38 000-$47,999 | 1.12 (1.06-1.19) | <.001 | |
| $48 000-$62,999 | 1.11 (1.05-1.17) | <.001 | |
| ≥$63 000 | — | — | |
| Percent No high school degree 2008-2012 | ≥21.0% | 1.13 (1.05-1.21) | .001 |
| 13.0-20.9% | 1.21 (1.13-1.29) | <.001 | |
| 7.0-12.9% | 1.15 (1.09-1.22) | <.001 | |
| <7.0% | — | — | |
| Year of diagnosis | 2015 | 1.10 (1.02-1.18) | .013 |
| 2014 | 1.15 (1.08-1.22) | <.001 | |
| 2013 | 1.09 (1.02-1.15) | .006 | |
| 2012 | 1.08 (1.02-1.14) | .009 | |
| 2011 | .99 (.94-1.05) | .746 | |
| 2010 | — | — | |
| Insurance status | Government | 1.15 (1.08-1.22) | <.001 |
| Private | .62 (.58-.66) | <.001 | |
| Not insured | — | — | |
| Race | Other | .82 (.72-.93) | .002 |
| Asian | .72 (.65-.80) | <.001 | |
| Black | 1.10 (1.05-1.15) | <.001 | |
| White | — | — | |
| Facility type | Community cancer program | 1.06 (.99-1.13) | .112 |
| Comprehensive community cancer program | 1.08 (1.02-1.14) | .005 | |
| Academic/research program | .98 (.93-1.04) | .564 | |
| Integrated network cancer program | — | — | |
| Great circle distance | >50 miles | 1.04 (.98-1.12) | .202 |
| 10-50 miles | .98 (.94-1.01) | .206 | |
| ≤10 miles | — | — | |
| Age at diagnosis | 1.02 (1.02-1.02) | <.001 | |
*
Number of observations in the original data set = 86 413. Number of observations used = 84 775.