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. 2019 Apr 17;21:100. doi: 10.1186/s13075-019-1892-0

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© The Author(s). 2019

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. 3 — Concordance (κ coefficient) between tender or swollen joint and GS/PD grades for each joint region. a κ coefficient between tenderness and GS grade. b κ coefficient between swelling and GS grade. c κ coefficient between tenderness and PD grade. d κ coefficient between swelling and PD grade. Abbreviations: GS gray scale, PD power Doppler, MCP metacarpophalangeal, PIP proximal interphalangeal