Table 4.

Comparison of the internal survival rate of Mayo staging system (the degree of differentiation and single trend).

Mayo staging system (n)	Median survival in months (95% CI)	P value
I (14)	48.8 (20.7–76.9)	<.001***
II (38)	25.1 (15.1–35.1)	.008**
III (166)	13.0 (11.8–14.2)	<.001*
IV (77)	7.4 (6.1–8.7)

^*P < .05,

^**P < .01,

^***P < .001.