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. 2009 Aug 13;339:b3128. doi: 10.1136/bmj.b3128

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This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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graphic file with name tenb621623.f2_default.jpg — Fig 2 Sizes of the disagreements between observer pairs in the calculated standardised mean differences (SMDs) from 10 meta-analyses. Comparisons are at the meta-analysis level. (*All the underlying trials were excluded)