Table 2. Main results of meta-analysis for colorectal cancer.

Variables	No. of studies	Effects model	HR (95%CI)	p	Heterogeneity
					I2(%)	Ph
OS	8	Random	1.28(0.86-1.91)	0.22	75.7	<0.001
Location
Western countries	5	Random	1.11(0.61-2.03)	0.734	82.5	<0.001
Eastern countries	3	Random	1.86(0.83-4.17)	0.132	66.1	0.053
Cancer type
CRC	6	Random	1.2(0.76-1.88)	0.44	80.5	<0.001
RC	2	Random	2.06(0.53-7.96)	0.294	63.8	0.097
Treatment
Surgical resection	7	Random	1.31(0.83-2.06)	0.244	79.2	<0.001
Chemoradiotherapy	1	-	1.21(0.63-2.33)	0.568	-	-
DFS	4	Random	1.71(0.78-3.72)	0.179	61.8	0.049
Location
Western countries	1	-	0.87(0.24-3.12)	0.831	-	-
Eastern countries	3	Random	2.16(0.75-6.18)	0.152	73.5	0.023
Cancer type
CRC	1	-	1.12(0.86-1.46)	0.414	-	-
RC	3	Fixed	2.47(1.21-5.05)	0.013	46.4	0.155
Treatment
Surgical resection	3	Fixed	1.13(0.87-1.46)	0.364	0	0.476
Chemoradiotherapy	1		4.01(1.55-10.37)	0.004	-	-