Table 5.

Multivariate analysis of factors affecting cancer specific survival

	Risk ratio	p value	95% confidence interval
Open operation	1.32	0.048	1.005–1.738
Stage of disease	1.83	<0.001	1.489–2.246
Differentiation	1.66	0.002	1.207–2.288
Perineural invasion	1.89	<0.001	1.372–2.611
Lymphovascular invasion	1.37	0.024	1.044–1.811
Postoperative complication	1.57	0.001	1.215–2.041
Rectal cancer	1.28	0.048	1.003–1.635