Table 3. Logistic regression for any chemotherapy use.

Variable	OR	95% CI low	95% CI high	p-value
Age group (<50 ref.) (y)
51–60	0.858	0.653	1.128	0.273
61–70	0.703	0.538	0.919	0.010
>70	0.292	0.222	0.384	<0.001
CCI (0 ref.)
CCI 1	0.853	0.759	0.959	0.008
CCI 2	0.649	0.531	0.793	<0.001
CCI 3+	0.594	0.416	0.848	0.004
cT stage (cT2 ref.)
cT3	1.440	1.232	1.684	<0.001
cT4	1.488	1.263	1.754	<0.001
Income (<$38,000 ref.)
$38,000–47,999	1.080	0.922	1.264	0.342
$48,000–62,999	1.217	1.041	1.422	0.014
≥$63,000	1.364	1.169	1.592	<0.001
Insurance (uninsured ref.)
Private	1.581	1.118	2.234	0.010
Medicaid	1.290	0.868	1.916	0.207
Medicare	1.356	0.954	1.927	0.089
Other govt or unknown	2.419	1.513	3.866	<0.001

OR, odds ratio; CI, confidence interval; Ref., reference; CCI, Charlson Comorbidity Index; Govt, government.