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.