Table 4. Univariate analysis of Age on CCSS based on different stages.

Variable	n	5-year survival (%)	Log rank χ2 test	P
Stage I
Age			0.575	0.448
≤40	133	96.9%
41–74	4430	96.2%
Stage II
Age			56.979	P<0.001
≤40	1384	90.5%
41–74	24483	85.2%
Stage III
Age			29.677	P<0.001
≤40	1497	65.9%
41–74	27908	59.8%