Table 3.

Metaregression analysis for OS and DFS.

Covariates	Multivariate analysis (OS)			Multivariate analysis (DFS)
	Coefficient	SE	P value	Coefficient	SE	P value
Site	-0.206	0.518	0.717	-0.522	0.181	0.213
TNM stage	0.039	0.435	0.934	0.121	0.133	0.531
Detection method	0.167	0.758	0.840	0.066	0.315	0.868
NOS score	-0.573	0.809	0.530	-0.638	0.335	0.308
Data extraction method	0.344	0.513	0.550	-1.313	0.550	0.253