Clinical characteristics and prognosis of young patients with colorectal cancer in Eastern China

Table 3 Survival of subgroup patients by stratified analysis with stage and approach of surgery

	Age (yr)	n	5-yr OS	10-yr OS	Median survival time (mo, 95%CI)
Total1	≤ 30	42	33.90%	26.10%	29.0 (18.0-40.0)
	> 30	1293	60.10%	52.20%	140.0 (111.6-168.4)
Stage I and II	≤ 30	10	68.60%	/4	/4
	> 30	665	78.60%	69.80%	264.0 (203.5-324.5)
Stage III and IV2	≤ 30	32	24.60%	14.80%	22 (2.6-41.4)
	< 30	628	40.40%	33.30%	35 (27.9-42.1)
Radical surgery3	≤ 30	28	44.30%	34.20%	40.0 (10.1-69.9)
	> 30	1082	69.60%	60.50%	/5
Non-radical surgery	≤ 30	14	14.30%	0%	6 (2.3-9.7)
	> 30	211	11.80%	0%	11 (9.2-12.8)

¹χ² = 14.146, P = 0.000;

²χ² = 5.101, P = 0.024;

³χ² = 7.830, P = 0.005;

⁴The sample was too small to analyze;

⁵The median survival time was not reached.