Table 3.
Adjusted odds ratios of adjuvant chemotherapy administration based on multivariate logistic regression.
| Odds ratio | 95% CI | p | |
|---|---|---|---|
| Age | |||
| ≥75 years | Ref = 1 | ||
| 18–64 years | 11.69 | 10.84–12.6 | <0.0001 |
| 65–74 years | 4.89 | 4.52–5.29 | <0.0001 |
| Gender | |||
| Male | Ref = 1 | ||
| Female | 1.06 | 1.0–1.12 | 0.0368 |
| Race | |||
| Black | Ref = 1 | ||
| White | 1.11 | 1.02–1.21 | 0.0139 |
| Hispanic | 1.3 | 1.12–1.49 | 0.0003 |
| Others | 1.13 | 0.96–1.34 | 0.1337 |
| Charlson/deyo score | |||
| 2 | Ref = 1 | ||
| 0 | 2.11 | 1.88–2.38 | <0.0001 |
| 1 | 1.68 | 1.48–1.91 | <0.0001 |
| Institution | |||
| Non-academic | Ref = 1 | ||
| Academic | 1.19 | 1.12–1.27 | <0.0001 |
| Location | |||
| Pacific | Ref = 1 | ||
| East North Central | 1.4 | 1.26–1.55 | <0.0001 |
| East South Central | 1.26 | 1.11–1.44 | 0.0005 |
| Middle Atlantic | 1.62 | 1.45–1.8 | <0.0001 |
| Mountain | 1.05 | 0.9–1.23 | 0.5254 |
| New England | 1.16 | 1.01–1.34 | 0.0316 |
| South Atlantic | 1.15 | 1.04–1.27 | 0.006 |
| West North Central | 1.38 | 1.22–1.57 | <0.0001 |
| West South Central | 1.2 | 1.06–1.36 | 0.0043 |
| Insurance | |||
| Uninsured | Ref = 1 | ||
| Insured | 1.1 | 0.96–1.26 | 0.1694 |
| Income | |||
| < $30,000 | Ref=1 | ||
| $30,000–$34,999 | 1.06 | 0.97–1.17 | 0.2071 |
| $35,000–$45,999 | 0.98 | 0.9–1.08 | 0.7154 |
| ≥$46,000 | 1.01 | 0.93–1.11 | 0.7599 |
| Year of diagnosis | |||
| 2009 | Ref = 1 | ||
| 2004 | 1.22 | 1.11–1.34 | <0.0001 |
| 2005 | 1.24 | 1.13–1.36 | <0.0001 |
| 2006 | 1.37 | 1.25–1.5 | <0.0001 |
| 2007 | 1.29 | 1.18–1.41 | <0.0001 |
| 2008 | 1.1 | 0.99–1.2 | 0.0526 |
| Primary site | |||
| Right | Ref = 1 | ||
| Left | 1.27 | 1.19–1.35 | <0.0001 |
| Transverse | 1.11 | 1.02–1.22 | 0.0194 |
| Grade | |||
| Well–differentiated | Ref = 1 | ||
| Moderately differentiated | 1.14 | 1.04–1.25 | 0.0061 |
| Poor/Undifferentiated | 1.76 | 1.58–1.97 | <0.0001 |
| Nodes evaluated | |||
| Adequate (≥ 12) | Ref = 1 | ||
| Inadequate (<12) | 1.15 | 1.08–1.22 | <0.0001 |
| AJCC, pT | |||
| 3 | Ref = 1 | ||
| 4 | 3.54 | 3.27–3.34 | <0.0001 |
| Colectomy | |||
| Total | Ref = 1 | ||
| Partial | 1.08 | 0.93–1.26 | 0.3234 |
| Subtotal | 1.14 | 0.98–1.33 | 0.0797 |
| Margins | |||
| Negative | Ref = 1 | ||
| Positive | 1.63 | 1.42–1.87 | <0.0001 |
Ref, Reference.