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. 2015 Dec 24;55(4):755–762. doi: 10.1093/rheumatology/kev426

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© The Author 2015. Published by Oxford University Press on behalf of the British Society for Rheumatology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Fig. 2 — Changes over time and standardized effect size of VAS pain, WOMAC pain and WOMAC total score

(A) The percentage reduction in VAS pain, WOMAC pain and WOMAC total in knee OA participants according to the group of treatment. (B) The standardized size effect induced by PEMF treatment is higher for the parameters evaluating pain (VAS score: −0.73 (95% CI −1.24 to −0.19); WOMAC pain: 0.61, 95% CI − 1.12 to − 0.09), while the effect size associated with an improvement in WOMAC, considering all the subscales, is −0.34 (95% CI − 0.85 to −0.17). PEMF: pulsed electromagnetic fields; VAS: visual analog scale.