Table 3. Results of meta-regression on OS.

Variables	Coefficient	Standard error	t	P value	95%CI
Year	−0.3586375	0.2829042	−1.27	0.229	−0.9750327, 0.2577577
Country	−0.3432079	0.4892228	−0.70	0.496	−1.409133, 0.7227171
Sample size	−0.0194861	0.0070848	−2.75	0.018	−0.0349225, −0.0040497
Cut-off	−0.8039943	0.2634475	−3.05	0.010	−1.377997, −0.22999915
Sample type	−1.118296	0.7370428	−1.52	0.155	−2.724175, 0.4875821