Maternal and perinatal outcomes of SARS-CoV-2 infection in unvaccinated pregnancies during Delta and Omicron waves.

Ultrasound Obstet Gynecol · 2022 · PMC9111049 · PMID 35441407

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did not reach statistical significanceno p-value reported

Although, in the Omicron wave vs in the Delta wave, the rate of invasive respiratory support (1.3% vs 4.5%) and maternal death (1.3% vs 3.2%) were lower, differences did not reach statistical significance.

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