Appendix Table 2.

Regression: Probability of receipt of oxaliplatin-containing therapy among those initiating oxaliplatin-containing therapy or other 5-FU therapy in 2003–2006; CCOP exposure measured as binary measure (Any CCOP claims vs. No CCOP claims).

Patient Characteristics	β	(SE)	p	OR	95% CI
Gender (ref = Male)
Female	−0.201 ^**	0.099	0.043	0.818	(0.674–0.993)
Race (ref = Caucasian)
African American	0.235	0.211	0.265	1.265	(0.837–1.912)
Other/Unknown	−0.022	0.235	0.924	0.978	(0.617–1.549)
Age (ref = 65–69)
70–74	−0.555 ^***	0.124	<.001	0.574	(0.450–0.732)
75–79	−0.939 ^***	0.121	<.001	0.391	(0.309–0.496)
80–84	−1.555 ^***	0.179	<.001	0.211	(0.149–0.300)
85+	−2.675 ^***	0.376	<.001	0.069	(0.033–0.144)
Education¹ (ref=Quartile 1)
Quartile 2: low–med education	0.057	0.131	0.665	1.058	(0.818–1.369)
Quartile 3: med–high education	−0.020	0.142	0.889	0.980	(0.742–1.295)
Quartile 4: highest education	0.339 ^**	0.151	0.025	1.403	(1.044–1.887)
Primary site of tumor (ref=Cecum, ascending)
Flexures, Transverse/Descending	−0.137	0.133	0.306	0.872	(0.672–1.133)
Large intestine/NOS	−0.443	0.331	0.181	0.642	(0.335–1.229)
Sigmoid	−0.088	0.120	0.466	0.916	(0.724–1.160)
Tumor grade (ref=poorly differentiated)
Well-differentiated	−0.420	0.270	0.120	0.657	(0.387–1.116)
Moderately differentiated	−0.241 ^**	0.114	0.034	0.786	(0.628–0.982)
Unknown	−0.102	0.279	0.716	0.903	(0.523–1.560)
Year of Chemo (ref=2004)
2003	−1.033 ^***	0.125	<.001	0.356	(0.279–0.454)
2005	0.771 ^***	0.118	<.001	2.163	(1.716–2.725)
2006	0.995 ^***	0.216	<.001	2.704	(1.770–4.131)
Dual eligibility (ref=no)
Yes	−0.180	0.170	0.291	0.835	(0.598–1.166)
Comorbidity conditions (ref=no, for each)
Liver disease	0.935	0.822	0.255	2.547	(0.509–12.752)
Rheumatoid disease or AIDs	−0.129	0.558	0.818	0.879	(0.295–2.626)
Renal disease	−1.935 ^**	0.756	0.011	0.144	(0.033–0.636)
Dementia or paralysis	−0.400	0.665	0.547	0.670	(0.182–2.467)
CHF or acute MI or CVD or COPD	−0.258	0.130	0.047	0.773	(0.599–0.997)
Neuropathy	−0.239	0.373	0.521	0.787	(0.379–1.636)
Diabetes	−0.287 ^**	0.136	0.035	0.750	(0.574–0.980)

*Organization characteristics (of treating hospital)*

CCOP-affiliated MD or Hospital	0.319 ^**	0.149	0.032	1.375	(1.028–1.840)
Any Direct Cooperative group affiliation (ref=no)	0.106	0.131	0.421	1.111	(0.859–1.438)
Any Medical School Affiliation (ref=unaffiliated)	−0.144	0.148	0.329	0.866	(0.648–1.156)
NCI-center affiliated (ref=no)	0.653	0.895	0.465	1.922	(0.333–11.097)

*Intercept*	0.557 ^***	0.210	0.008	1.745	(1.157–2.631)

Estimates of Model Fit
QIC	2,595.47
QICu	2,588.16
Sample Size	2,253

Significance:

.10;

^**

.05;

^***

.01

Proportion of patient’s census tract population with high school education or greater.