Fig 5. Indicators of transparency across fields of science on PMCOA.

(A) Reporting of indicators of transparency across fields of science for all articles on PMCOA since 1990. COI and Funding disclosures are by far the most highly reported indicators within all fields, whereas Code sharing and Protocol registration are by far the least reported. The indicator with the biggest proportional difference between minimum and maximum reporting across fields of science was Protocol registration (0.1% versus 5.8%; Coefficient of variation, 130), and the indicator with the smallest proportional difference was Funding disclosure (53.9% versus 90.0%; Coefficient of variation, 14.5). (B) Indicators of transparency in all articles of PMCOA published between 2015 and 2019 across galaxies of science. The galaxy in gray represents all clusters of articles published between 2015 and 2019. On top of the gray galaxy, we overlaid colored representations of the proportion of each cluster that is open access or reports on any of the indicators of transparency. The open access galaxy is very similar to that of COI and Funding disclosures, suggesting that most of the open literature reports on both. A number of Chemistry (blue) and Biology (green) clusters are smaller in COI disclosure, whereas a number of Health services (red) and Infectious diseases (burgundy) clusters are smaller in Funding disclosure. Biology (green) and Infectious diseases (burgundy) are pronounced in Data sharing. A very small proportion of clusters report Code sharing or open Protocol registration—of those, the majority are Biology (green) and Health services (red) clusters, respectively. The data underlying this figure can be found on OSF at http://www.doi.org/10.17605/OSF.IO/E58WS. COI, Conflict of interest; OSF, Open Science Framework; PMCOA, PubMed Central Open Access.