Table 2 Length of stay among newborns born ≥35 gestational weeks by admission to higher level nursery, PHD^a, May 2020–February 2022^b.

		Overall			Pre-delta			Delta			Omicron			Pre-delta vs. Delta	Delta vs. Omicron	Omicron vs. Pre-delta
Level II + nursery		n	Median (IQR)	p-value^c	n	Median (IQR)	p-value^c	n	Median (IQR)	p value^c	count	Median (IQR)	p-value^c	p-valued	p-value^d	p-value^d
Overall	Overall	1,330,376	2.0 (1.0–2.0)		833,228	2.0 (1.0–2.0)		322,260	2.0 (1.0–2.0)		174,888	2.0 (1.0–2.0)
	COVID+	767	2.0 (2.0–3.0)	<0.0001	223	2.0 (2.0–3.0)	<0.0001	183	2.0 (2.0–3.0)	<0.0001	361	2.0 (2.0–3.0)	<0.0001	0.9244	0.3704	0.4069
	COVID-	1,329,609	2.0 (1.0–2.0)		833,005	2.0 (1.0–2.0)		322,077	2.0 (1.0–2.0)		174,527	2.0 (1.0–2.0)
Yes	Overall	168,923	3.0 (2.0–5.0)		107,570	3.0 (2.0–5.0)		40,311	3.0 (2.0–5.0)		21,042	3.0 (2.0–5.0)
	COVID+	155	4.0 (2.0–11.0)	<0.0001	57	4.0 (2.0–11.0)	0.0097	39	4.0 (3.0–13.0)	0.0013	59	3.0 (2.0–12.0)	0.0421	0.5273	0.2148	0.7281
	COVID-	168,768	3.0 (2.0–5.0)		107,513	3.0 (2.0–5.0)		40,272	3.0 (2.0–5.0)		20,983	3.0 (2.0–5.0)
No	Overall	1,161,453	2.0 (1.0–2.0)		725,658	2.0 (1.0–2.0)		281,949	2.0 (1.0–2.0)		153,846	2.0 (1.0–2.0)
	COVID+	612	2.0 (2.0–2.0)	<0.0001	166	2.0 (2.0–2.0)	0.0036	144	2.0 (2.0–2.0)	0.0183	302	2.0 (2.0–2.0)	<0.0001	0.9612	0.6674	0.6968
	COVID-	1,160,841	2.0 (1.0–2.0)		725,492	2.0 (1.0–2.0)		281,805	2.0 (1.0–2.0)		153,544	2.0 (1.0–2.0)

COVID-19 coronavirus disease 2019, PHD Premier Healthcare Database Special COVID-19 release.
^aPremier Healthcare Database, 523 hospitals with delivery hospitalizations.
^bPre-delta: May 2020-May 2021; Delta: June-November 2021; Omicron: December 2021–February 2022.
^cP value associated with Wilcoxon rank sum test testing for differences by COVID-19 status; significant results are bolded.
^dP value associated with Wilcoxon rank sum test testing for differences by time period; significant results are bolded.

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