Main findings
In this comparative study of the current COVID-19 pandemic versus the pre-pandemic period, we report an increase in hemoglobin and fibrinogen levels and a decrease in platelets and white blood cells levels. The periods analyzed were independently associated with hemoglobin level after adjusting for confounders in a regression analysis. Additionally, we report an increase in post-partum hemorrhage and a decrease in preterm delivery at <34 weeks gestation and in the occurrence of composite neonatal outcome during the mask-wearing period.