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. 2016 Feb 16;75(11):1964–1970. doi: 10.1136/annrheumdis-2015-208387

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The overall treatment effect and the proportion attributable to contextual effect (PCE) for pain in osteoarthritis. The overall length of the bar represents the effect size (ES) of overall treatment effect; the blue component of the bar and the label represents the PCE of each treatment (measured by ratio of the ESs between contextual effect and overall treatment effect, ranging from no contribution from contextual effect (=0) to 100% contribution from contextual effect (=1); the red component represent the proportion attributable to specific effect of each treatment). CS, chondroitin sulfate; GS, glucosamine sulfate; IACS, intra-articular corticosteroid; IAHA, intra-articular hyaluronic acid; NSAID, non-steroidal anti-inflammatory drug; PEMF, pulsed-electromagnetic field therapy.