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Table 1 Selections of eligible meta-analyses with at least 10 studies from the Cochrane Library

From: The normality assumption on between-study random effects was questionable in a considerable number of Cochrane meta-analyses

 

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

  1. aOriginally reported effect measures in Cochrane meta-analyses
  2. bOdds ratios, relative risks, and risk differences re-calculated from 2 \(\times\) 2 tables for meta-analyses with binary outcomes
  3. cThe restricted maximum-likelihood algorithm failed to converge
  4. dThe between-study variance estimate was 0
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BMC Medicine

ISSN: 1741-7015

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