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| Variable (N of denominator) | N (%)a |
|---|
| Preprint server (N = 1088) |
| medRxiv | 842 (77) |
| bioRxiv | 246 (23) |
| Country in the author affiliation (N = 1088) |
| China | 563 (52) |
| USA | 298 (27) |
| UK | 92 (8.4) |
| Italy | 51 (5.3) |
| Hong Kong | 43 (3.9) |
| Other | 41 (3.7) |
| Self-reported study design (N = 494) |
| Modelling | 306 (62) |
| Retrospective study | 59 (12) |
| Cross-sectional study | 35 (7.1) |
| Cohort study | 22 (4.4) |
| Systematic review with or without meta-analysis | 21 (4.3) |
| Other | 51 (10) |
| Thematic classification (N = 1088) |
| Transmission/risk/prevalence | 470 (43) |
| Health impacts of COVID-19 | 163 (15) |
| Genetics/biology | 127 (12) |
| Diagnosis | 101 (9.2) |
| Treatment development | 84 (7.7) |
| Other | 137 (13) |
| Country of study funders (N = 681) |
| China | 312 (46) |
| USA | 107 (16) |
| UK | 14 (2) |
| Japan | 13 (1.9) |
| China and USA | 11 (1.6) |
| Other | 224 (33) |
- 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
