Table 5.

Meta-regression (remove size)

Variance	Coefficient	Standard Error	P value	RDOC	[95% CI]
Cte.	2.481	0.9584	0.0293	----	----
S	0.198	0.2100	0.3694	----	----
Sample	0.501	0.2261	0.0488	1.65	(1.00 - 2.71)
Expression	-0.279	0.3937	0.4937	0.76	(0.32 - 1.80)

Tau-squared estimate = 0.3560 (convergence is achieved after 10 iterations);

Restricted maximum likelihood estimation (REML);

No. studies = 15.