The source dataset included 3749 trials. We excluded 3646 trials without results. For the 103 trials with results, we screened all 155 results to verify the publication types in order to ensure exclusion of “other” results beyond journal articles and preprints, such as grey literature, conference abstracts and presentations, research letters and notes, etc. We recoded an “application note” from a “journal article” to an “other” result (ChiCTR2000029542: 10.1093/jmcb/mjaa014). We recoded 3 “other” results to “journal article” (NCT04399746: no DOI; NCT04315480: 10.1101/2020.07.11.20151365; NCT04340050: 10.1111/joim.13185) and 1 to “preprint” (NCT04340050: 10.1101/2020.06.21.20132944). After recoding these results, we then excluded all summary results (n = 10) and other results (n = 26). We also excluded two non-English results (trials: ChiCTR2000029381 and NCT04261517) and one result for which we could not access the full-text publication (trial: NCT04332081). Our analysis dataset comprised 87 trials with 116 results.
Inclusion criteria:
- Full or interim results, journal article or preprint
- English-language publication
- Full-text accessible
Exclusion criteria:
- Summary results
- Other results, such as grey literature, research letters and notes, etc. (categorized as “other” publication type in DIRECCT dataset)