Primary tumor location and survival in colorectal cancer: A retrospective cohort study

Table 3 Cox regression estimation in the propensity score–matched sample (n = 792)

	Log (HR)	HR	SE [Log (HR)]	Robust SE [Log (HR)]	Z	P value
Cetuximab	0	1.00	0.18	0.19	0	0.996
LPTL	-0.58	0.56	0.13	0.15	-3.89	< 0.001
Cetuximab × LPTL	-0.14	0.87	0.24	0.25	-0.57	0.566

Data for right-sided primary tumor location were used as a reference in this model. HR: Hazard ratio; LPTL: Left-sided primary tumor location; SE: Standard error.