Table 6.

Meta-regression (remove expression)

Variance	Coefficient	Standard Error	P value	RDOC	[95% CI]
Cte.	1.729	0.4298	0.0017	----	----
S	0.268	0.1721	0.1453	----	----
Sample	0.524	0.2187	0.0339*	1.69	(1.05 - 2.72)

Tau-squared estimate = 0.3297 (convergence is achieved after 9 iterations);

Restricted maximum likelihood estimation (REML);

No. studies = 15.