Dataset for article: Changes in evidence for studies assessing interventions for COVID-19 reported in preprints: meta-research study. BMC Med 18, 402 (2020).

This dataset was used in the analyses reported in Oikonomidi, T., Boutron, I., Pierre, O. et al. Changes in evidence for studies assessing interventions for COVID-19 reported in preprints: meta-research study. BMC Med 18, 402 (2020). https://doi.org/10.1186/s12916-020-01880-8. This project is ancillary to the COVID-NMA Living systematic review and network meta-analysis of Covid-19 trials: https://covid-nma.com/ The first spreadsheet entitled "key" includes the full description of the dataset.