Table 5.

Final Cox Proportional Hazards Model in Propensity Score-Matched Cohort

Variable	Hazard Ratio	95% CI	P valuea
Laparoscopic Colectomy	0.936	0.760-1.152	0.5301
Female Gender	0.996	0.805-1.232	0.9693
Positive Nodes	2.028	1.504-2.735	< 0.0001
Chemotherapy Receipt	0.550	0.423-0.717	< 0.0001
Chemotherapy*ln(survival time)	1.460	1.222-1.744	< 0.0001
Regional Stage disease	1.520	1.103-2.095	0.0105b
Distant Stage disease	6.463	4.409-9.472	< 0.0001b

^a Wald test.

^b Compared with localized disease.