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. 2016 Aug 5;35:24. doi: 10.1186/s41043-016-0060-2

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Comparison of T-score among groups according to frequency of coffee intake. a The results of comparison of T-score among groups according to model 1 (frequency of coffee intake were categorized by group 1: seldom, group 2: once or twice per week and group 3: greater than or equal to once per 2 days). The mean T-score was −1.26, −1.05, and −1.05 in the three groups, respectively. There were no significantly differences among the three groups (P = 0.079). b The results of comparison of T-score among groups according to model 2 (frequency of coffee intake were categorized by group 1: seldom, group 2: moderate). The mean T-score was −1.26 and −1.05 in the two groups, respectively. There were significantly differences between the two groups (P = 0.024)