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. 2014 Jul 22;4(7):e005632. doi: 10.1136/bmjopen-2014-005632

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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Forest plots of RR (relative risk) with 95% CI of T2DM associated with the tea consumption stratified (A) by the frequency of tea consumption^a in random model and (B) by random-effect model (≥3 cups/day of tea consumption vs the reference). ^aThe frequency of tea consumption was classified as non/lowest, 0–1, 1–3 and ≥4 cups/day. Non/lowest of tea consumption group was regarded as the reference. Black square means value of RR, and the size of the square means inversely proportional to its variance. Horizontal line means 95% CI of RR. Black diamond means pooled results. The studies were ordered by published year.