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Table 2 Characteristics of analyzed preprint articles

From: Research methodology and characteristics of journal articles with original data, preprint articles and registered clinical trial protocols about COVID-19

Variable (N of denominator)N (%)a
Preprint server (N = 1088)
 medRxiv842 (77)
 bioRxiv246 (23)
Country in the author affiliation (N = 1088)
 China563 (52)
 USA298 (27)
 UK92 (8.4)
 Italy51 (5.3)
 Hong Kong43 (3.9)
 Other41 (3.7)
Self-reported study design (N = 494)
 Modelling306 (62)
 Retrospective study59 (12)
 Cross-sectional study35 (7.1)
 Cohort study22 (4.4)
 Systematic review with or without meta-analysis21 (4.3)
 Other51 (10)
Thematic classification (N = 1088)
 Transmission/risk/prevalence470 (43)
 Health impacts of COVID-19163 (15)
 Genetics/biology127 (12)
 Diagnosis101 (9.2)
 Treatment development84 (7.7)
 Other137 (13)
Country of study funders (N = 681)
 China312 (46)
 USA107 (16)
 UK14 (2)
 Japan13 (1.9)
 China and USA11 (1.6)
 Other224 (33)
  1. aDenominator is provided in the first column, as “N of trials with reported variable”; for some variables due to rounding the sums may not be exact 100%, for variables we presented only five most frequent categories