Table 3. Changes in case volume by site and by ACGME index case classification.

Values are percentage change from 2019 to 2020 for case volume.

ACGME: Accreditation Council for Graduate Medical Education; EP: Early Pandemic Phase; OR: Operating Room; PP: Pre-Pandemic Phase; R1: Recovery 1 Phase; R2: Recovery 2 Phase; STC: Shock Trauma Center; UMMC: University of Maryland Medical Center.

	Change in volume 2019 to 2020 for equivalent period				P value
	PP	EP	R1	R2	PP	EP	R1	R2
Case volume (%)
Total	-1.8	-55.3	-37.4	-17.6	0.493	<0.001	<0.001	<0.001
UMMC-main ORs	-2.9	-50.0	-25.0	-7.7	0.426	<0.001	0.012	0.009
UMMC-outpatient ORs	-11.1	-50.0	-10.6	-11.9	0.046	<0.001	0.286	0.123
UMMC-obstetric unit	-5.9	-10.8	-7.5	-12.8	0.367	0.127	0.581	0.067
UMMC-endoscopy	0.1	-97.5	-100.0	-52.8	0.985	<0.001	<0.001	<0.001
UMMC-out-of-OR	24.0	-81.8	-52.1	-34.5	0.016	<0.001	0.023	<0.001
STC OR	-3.7	-37.7	-29.1	-12.1	0.358	<0.001	0.013	<0.001
Index case volume (%)
Pediatrics (< 12 y)	5.8	-72.1	-51.9	-11.2	0.315	<0.001	0.008	0.055
Pediatrics (< 3 y)	12.9	-53.5	-42.9	-1.8	0.191	0.006	0.013	0.814
Regional procedures	20.5	-42.3	-54.5	-8.7	0.184	0.053	0.017	0.368
Vaginal delivery	-17.5	-9.0	-19.6	-21.2	0.065	0.358	0.455	0.022
Cesarean delivery	12.6	-10.8	27.5	-3.1	0.453	0.558	0.048	0.754
Lung isolation	-19.3	-50.0	-35.7	-21.6	0.107	0.066	0.022	0.044
Cardiopulmonary bypass	-2.9	-52.3	-19.3	-6.4	0.759	0.003	0.174	0.403
Major vascular	8.9	-50.6	27.8	8.6	0.728	0.050	0.495	0.669
Pain procedures	-3.2	-43.2	-4.0	-25.5	0.569	0.022	0.746	<0.001