Table 2.

Stratified analyses of overall survival.

Subgroup analysis	No. of studies	No. of patients	HR	95% CL	I 2(%)	P	Model
Analysis method
Multivariate	4	399	3.20	2.20-4.64	0.0	0.622	Fixed
Univariate	6	338	1.97	1.34-2.9	0.0	0.984	Fixed
Sample size
≥100	2	271	3.88	2.36-6.39	0.0	0.58	Fixed
<100	8	466	2.13	1.55-2.92	0.0	0.988	Fixed
Follow-up time
>5 years	5	369	2.72	1.86-3.96	0.0	0.627	Fixed
≤5 years	5	368	2.36	1.62-3.45	0.0	0.606	Fixed
Cancer type
Gastrointestinal cancer	4	326	2.55	1.80-3.63	0.0	0.653	Fixed
Others	6	411	2.5	1.66-3.78	0.0	0.557	Fixed