RESEARCH Open Access Empirical evidence for outcome reporting bias in Conclusions: We find that prospective registration for randomized clinical trials on acupuncture is insufficient, selective TRIALS

Full list of author information is available at the end of the articleoutcome reporting is prevalent, and the change of primary outcomes is intended to favor statistical significance. These discrepancies in outcome reporting may lead to biased and misleading results of randomized clinical trials on acupuncture. To ensure publication of reliable and unbiased results, further promotion and implementation of trial registration are still needed