@article {Gartlehnerbmjebm-2021-111846, author = {Gerald Gartlehner and Robert Emprechtinger and Marlene Hackl and Franziska L Jutz and Jacob E Gartlehner and Julian N Nonninger and Irma Klerings and Andreea Iulia Dobrescu}, title = {Assessing the magnitude of reporting bias in trials of homeopathy: a cross-sectional study and meta-analysis}, elocation-id = {bmjebm-2021-111846}, year = {2022}, doi = {10.1136/bmjebm-2021-111846}, publisher = {Royal Society of Medicine}, abstract = {Objectives To assess the magnitude of reporting bias in trials assessing homeopathic treatments and its impact on evidence syntheses.Design A cross-sectional study and meta-analysis. Two persons independently searched Clinicaltrials.gov, the EU Clinical Trials Register and the International Clinical Trials Registry Platform up to April 2019 to identify registered homeopathy trials. To determine whether registered trials were published and to detect published but unregistered trials, two persons independently searched PubMed, Allied and Complementary Medicine Database, Embase and Google Scholar up to April 2021. For meta-analyses, we used random effects models to determine the impact of unregistered studies on meta-analytic results.Main outcomes and measures We report the proportion of registered but unpublished trials and the proportion of published but unregistered trials. We also assessed whether primary outcomes were consistent between registration and publication. For meta-analyses, we used standardised mean differences (SMDs).Results Since 2002, almost 38\% of registered homeopathy trials have remained unpublished, and 50\% of published randomised controlled trials (RCTs) have not been registered. Retrospective registration was more common than prospective registration. Furthermore, 25\% of primary outcomes were altered or changed compared with the registry. Although we could detect a statistically significant trend toward an increase of registrations of homeopathy trials (p=0.001), almost 30\% of RCTs published during the past 5 years had not been registered.A meta-analysis stratified by registration status of RCTs revealed substantially larger treatment effects of unregistered RCTs (SMD: -0.53, 95\% CI -0.87 to -0.20) than registered RCTs (SMD: -0.14, 95\% CI -0.35 to 0.07).Conclusions Registration of published trials was infrequent, many registered trials were not published and primary outcomes were often altered or changed. This likely affects the validity of the body of evidence of homeopathic literature and may overestimate the true treatment effect of homeopathic remedies.Data are available upon reasonable request. Data available upon reasonable request.}, issn = {2515-446X}, URL = {https://ebm.bmj.com/content/early/2022/05/08/bmjebm-2021-111846}, eprint = {https://ebm.bmj.com/content/early/2022/05/08/bmjebm-2021-111846.full.pdf}, journal = {BMJ Evidence-Based Medicine} }