Table 3.
Logistic Regression of Characteristics Associated With Initiation of Chemotherapy Within 3 Months of Colon Resection
| Characteristic | OR | 95% CI | P |
|---|---|---|---|
| Age at diagnosis, years | |||
| 66-70 | 1.0 | < .001 | |
| 71-75 | 0.746 | 0.63 to 0.884 | < .001 |
| 76-80 | 0.37 | 0.313 to 0.438 | < .001 |
| 81-85 | 0.149 | 0.125 to 0.178 | < .001 |
| ≥ 86 | 0.032 | 0.026 to 0.039 | < .001 |
| Race/ethnicity | |||
| White | 1.0 | ||
| Black | 0.682 | 0.54 to 0.861 | .0013 |
| Hispanic | 1.064 | 0.823 to 1.376 | .6343 |
| Other | 1.219 | 0.903 to 1.646 | .1949 |
| Sex | |||
| Male | 1.0 | ||
| Female | 1.055 | 0.943 to 1.181 | .352 |
| Marital status | |||
| Married | 1.0 | ||
| Not married | 0.594 | 0.534 to 0.659 | < .001 |
| Unknown | 0.548 | 0.417 to 0.721 | < .001 |
| Comorbidity score | |||
| 0 | 1.0 | ||
| 1 | 0.754 | 0.674 to 0.843 | < .001 |
| ≥ 2 | 0.538 | 0.473 to 0.611 | < .001 |
| Medicaid eligibility | |||
| Not eligible | 1.0 | ||
| Eligible before diagnosis | 0.351 | 0.214 to 0.578 | < .001 |
| Eligible before and after diagnosis | 0.602 | 0.51 to 0.709 | < .001 |
| Eligible after diagnosis | 0.346 | 0.222 to 0.541 | < .001 |
| Income level | |||
| ≤ $20,000 | 1.0 | ||
| $20,001-$25,000 | 0.916 | 0.672 to 1.25 | .5804 |
| $25,001-$30,000 | 0.936 | 0.693 to 1.262 | .6632 |
| ≥ $30,001 | 0.966 | 0.734 to 1.271 | .8048 |
| Diagnosis year | |||
| 2000 | 1.0 | ||
| 2001 | 0.915 | 0.773 to 1.082 | .2993 |
| 2002 | 0.934 | 0.778 to 1.122 | .4678 |
| 2003 | 1.13 | 0.949 to 1.347 | .1701 |
| 2004 | 0.959 | 0.806 to 1.141 | .6394 |
| 2005 | 0.824 | 0.692 to 0.981 | .0292 |
| SEER registry area | |||
| San Francisco | 1.0 | ||
| Connecticut | 1.283 | 0.896 to 1.837 | .1741 |
| Detroit | 1.243 | 0.903 to 1.711 | .1814 |
| Hawaii | 1.167 | 0.801 to 1.7 | .422 |
| Iowa | 1.103 | 0.789 to 1.541 | .5666 |
| New Mexico | 1.025 | 0.721 to 1.458 | .8901 |
| Seattle | 1.018 | 0.685 to 1.513 | .9283 |
| Utah | 0.911 | 0.674 to 1.231 | .5439 |
| Atlanta | 1.09 | 0.78 to 1.524 | .6139 |
| San Jose | 1.093 | 0.738 to 1.618 | .6572 |
| Los Angeles | 1.641 | 1.219 to 2.209 | .0011 |
| Rural Georgia | 1.056 | 0.372 to 2.998 | .9181 |
| Greater California | 1.314 | 0.98 to 1.763 | .0682 |
| Kentucky | 1.378 | 1.012 to 1.877 | .0417 |
| Louisiana | 1.369 | 1.001 to 1.87 | .049 |
| New Jersey | 1.393 | 1.047 to 1.854 | .0229 |
| No. of medical oncologists in patient residence HSA | |||
| None | 1.0 | ||
| One to two | 1.451 | 1.137 to 1.853 | .0028 |
| Three to eight | 1.497 | 1.186 to 1.89 | < .001 |
| ≥ Nine | 1.322 | 1.077 to 1.623 | .0077 |
Abbreviations: HSA, hospital service area; OR, odds ratio.