Table 2.

Maternal adverse outcomes among pregnant women tested positive for SARS-CoV-2 according to the pre-Delta, Delta, and Omicron periods.

	Pre-Delta			Delta			Omicron
	n = 1402			n = 262			n = 391
	n	%	95%CI	n	%	95% CI	n	%	95% CI
Maternal adverse outcome	47	3.4%	2.5–4.4	17	6.5%	3.8–10.2	4	1.0%	0.3–2.6
Inpatient management	176	12.6%	10.9–14.4	45	17.2%	12.8–22.3	49	12.5%	9.4–16.2
Standard unit	131	9.3%	7.9–11.0	32	12.2%	8.5–16.8	45	11.5%	8.5–15.1
ICU admission	45	3.2%	2.4–4.3	13	5.0%	2.7–8.3	4	1.0%	0.3–2.6
Length ICU >7 days	12	0.9%	0.4–1.5	5	1.9%	0.6–4.4	0	0.0%	0.0–0.9
Maternal complications
Pneumonia	33	2.4%	1.6–3.3	5	1.9%	0.6–4.4	0	0.0%	0.0–0.9
ARDS	56	4.0%	3.0–5.2	8	3.1%	1.3–5.9	0	0.0%	0.0–0.9
Oxygen supply requirement	66	4.7%	3.7–6.0	26	9.9%	6.6–14.2	2	0.5%	0.1–1.8
Standard oxygen	35	2.5%	1.7–3.5	13	5.0%	2.7–8.3	2	0.5%	0.1–1.8
High Flow oxygen	12	0.9%	0.4–1.5	3	1.1%	0.2–3.3	0	0.0%	0.0–0.9
Non-invasive ventilation	5	0.4%	0.1–0.8	3	1.1%	0.2–3.3	0	0.0%	0.0–0.9
Mechanical ventilation	14	1.0%	0.5–1.7	7	2.7%	1.1–5.4	0	0.0%	0.0–0.9
ECMO	7	0.5%	0.2–1.0	0	0.0%	0.0–1.4	0	0.0%	0.0–0.9
Maternal death (any reason)	3	0.2%	0.0–0.6	0	0.0%	0.0–1.4	0	0.0%	0.0–0.9

ICU: intensive care unit, ARDS: acute respiratory distress syndrome, ECMO: extracorporeal membrane oxygenation.