Table 1.

Selections of eligible meta-analyses with at least 10 studies from the Cochrane Library

	Binary outcome (N = 6162)				Non-binary outcome (N = 4014)
	Originala	ORb	RRb	RDb	Originala
REML failing to convergec	259	273	272	217	101
${\widehat{\tau }}^2$=0d	1669	1678	1719	1219	480
Eligible meta-analyses	4234	4211	4171	4726	3433

^aOriginally reported effect measures in Cochrane meta-analyses

^bOdds ratios, relative risks, and risk differences re-calculated from 2 $\times$ 2 tables for meta-analyses with binary outcomes

^cThe restricted maximum-likelihood algorithm failed to converge

^dThe between-study variance estimate was 0