Table 3.

Results of meta-regression on OS and PFS

Variable	OS				PFS
	Coef	SE	P-value	Adjusted R2	Coef	SE	P-value	Adjusted R2
Year	−0.0234	0.0652	0.731	−27.06%	0.0392	0.1679	0.827	−34.46%
Country	−0.0588	0.1123	0.619	−22.55%	−0.1298	0.2703	0.656	−28.19%
Sampling time	−0.4929	0.6007	0.443	−10.16%	–	–	–	–
Cutoff value	−0.0555	0.0822	0.525	−16.89%	−0.1640	0.2014	0.461	−12.55%
Quality	0.3685	0.4615	0.455	−10.11%	0.7849	0.9145	0.439	−5.75%

Notes: Adjusted R², proportion of between-study variance explained. –, not available.

Abbreviations: Coef, coefficient; OS, overall survival; PFS, progression-free survival; SE, standard error.