Table 1. Registries assessed.
| Name of Registry | Registry URL | Country | Total trials | COVID-19 | COVID-19+ pregnancy a |
|---|---|---|---|---|---|
| International Clinical Trials Registry Platform | https://www.who.int/ictrp/en/ | World | 621,370 | 927 (0.15) | 16 (1.7) |
| Clinicaltrials.gov | https://clinicaltrials.gov | World | 335,447 | 388 (0.12) | 5 (1.3) |
| Australian New Zealand Clinical Trials Registry | http://www.anzctr.org.au | Australia/New Zealand | 27,003 | 15 (0.06) | 1 (6.7) |
| International Standard Registered Clinical/Social Study Number | http://www.isrctn.com/ | United Kingdom | 19,292 | 12 (0.06) | 1 (8.3) |
| European Union Clinical Trials Register | https://www.clinicaltrialsregister.eu | European Union | 36,866 | 48 (1.3) | 1 (2.1) |
| Japan Primary Registry Network | http://rctportal.niph.go.jp/en/ | Japan | 44,765 | 41 (0.09) | 0 |
| Iranian Registry of Clinical Trials | www.irct.ir/ | Iran | 23,973 | 61 (0.25) | 0 |
| Clinical Trials Registry–India | http://ctri.nic.in/Clinicaltrials/login.php | India | n/a | 6 | 0 |
| Chinese Clinical Trial Registry | www.chictr.org/en/ | China | 31,344 | 529 (1.7) | 4 (0.76) |
| The Netherlands National Trial Register | www.trialregister.nl/trialreg | Netherlands | 8,511 | 22 (0.26) | 1 (4.5) |
| German Clinical Trials Register | https://drks-neu.uniklinik-freiburg.de/drks_web/ | Germany | 9,541 | 6 (0.06) | 0 |
| Health Canada Clinical Trials Database | http://ctdb-bdec.hc-sc.gc.ca | Canada | 2,850 | 6 (0.21) | 0 |
| Clinical Research Information Service, Republic of Korea | https://cris.nih.go.kr/cris/en | Korea | 4,884 | 0 | 0 |
| Brazilian Clinical Trials Registry | www.ensaiosclinicos.gov.br/ | Brazil | 3,957 | 3 (0.08) | 0 |
| Pan African Clinical Trial Registry | www.pactr.org/ | African continent | n/a | 1 | 0 |
| Thai Clinical Trials Registry | www.clinicaltrials.in.th/ | Thailand | n/a | 4 | 0 |
| Cuban Public Registry of Clinical Trials | http://registroclinico.sld.cu/en/home | Cuba | n/a | 0 | 0 |
| Sri Lanka Clinical Trials Registry | www.slctr.lk/ | Sri Lanka | n/a | 0 | 0 |
Abbreviations: COVID-19, coronavirus disease 2019; n/a, not applicable.
Registries were not mutually exclusive.
a
Number of COVID-19 trials that included “pregnant women” or “pregnancy.”
Data reported as n (%) with the % calculated using the number of COVID-19 trials as denominator.