Influence of control group on effect size in trials of acupuncture for chronic pain: a secondary analysis of an individual patient data meta-analysis.

PLoS One · 2014 · PMC3976298 · PMID 24705624

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did not reach statistical significanceno p-value reported

With regard to non-acupuncture controls, we found evidence that the effect size of acupuncture when compared to protocolled care is smaller than when compared to the less intensive routine care, although differences did not reach statistical significance.

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