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. 2014 Dec 8;56(12):1235–1242. doi: 10.1097/JOM.0000000000000323

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© 2014 by American College of Occupational and Environmental Medicine

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially.

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FIGURE 3. — Article quality among included studies does not affect the risk estimate. Included studies were assessed and divided into two groups (one comprising seven articles and the other six) on the basis of quality scores. If two articles with an identical quality score need to allocate into two groups, then we arbitrarily allocated the newer article to the high-quality group, to balance the group sizes. The meta-analysis of articles (random-effects model) with higher quality scores is shown in the upper panel, and the meta-analysis of articles with lower scores is presented in the lower panel.