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. 2014 Feb 27;9(2):e89442. doi: 10.1371/journal.pone.0089442

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© 2014 Lv et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The overall analysis of anti-CCP antibody status showed a pooled RR of 0.88 (95% CI: 0.76–1.03, p = 0.11) and an I² of 67%. Subgroup analyses on different response criteria revealed no significant differences.