Study design and population
This prospective, observational study involved epidemiological
information from pregnant women with SARS-CoV-2 between March
1st and May 31st, 2020. Data were
collected from the Spanish Registry of COVID-19.15 A
total of 100 Spanish centers participate in the Registry, representing
49.95% (n = 172,000) of total deliveries (N = 359,770) carried out in
2019 in Spain.16 Finally a total of 70 centers
included cases in the present study. The study was firstly approved by
the Puerta de Hierro University Hospital Ethics Committee, and
subsequently by the Ethics Committee of each participating hospital.
Procedures were in concordance with the Declaration of Helsinki. Oral
informed consent was obtained from each participant.