Table 2.

Mean Study Volumes in Weeks 1–9 (Pre-SOE Period) and Weeks 12–19 (Post-SOE Period) and Lowest Weekly Volume Through Weeks 12–19 at the Main Hospital Campus and the Affiliated Imaging Centers

	Weeks 1–9				Weeks 12–19				Weeks 12–19		Pre-SOE Vs Post-SOE
	Main		Affiliated		Main		Affiliated		Main	Affiliated	Main	Affiliated
	Mean (% of Baseline)	95% CI*	Mean (% of Baseline)	95% CI	Mean (% of Baseline)	95% CI	Mean (% of Baseline)	95% CI	Lowest Weekly Volume (% of Baseline)		p Value
Total volume	10,855 (100%)	10,472–11,239	10,163 (100%)	9778–10,549	5028 (46%)	4551–5506	3709 (36%)	3294–4125	4460 (Week 15) (41%)	3024 (Week 13) (30%)	< 0.001	< 0.001
Image modality
Radiography	5303 (100%)	5069–5537	3762 (100%)	3603–3922	2689 (51%)	2551–2828	1475 (39%)	1289–1661	2529 (Week 12) (48%)	1050 (Week 12) (28%)	< 0.001	< 0.001
CT	2047 (100%)	1994–2100	1621 (100%)	1570–1672	1209 (59%)	1044–1373	921 (57%)	808–1034	931 (Week 13) (45%)	763 (Week 13) (47%)	< 0.001	< 0.001
Ultrasound	1198 (100%)	1148–1248	1816 (100%)	1742–1891	566 (47%)	497–635	731 (40%)	652–809	459 (Week 15) (38%)	626 (Week 15) (34%)	< 0.001	< 0.001
Mammography	815 (100%)	764–866	1471 (100%)	1390–1553	69 (8%)	51–86	118 (8%)	74–162	38 (Week 15) (5%)	58 (Week 15) (4%)	< 0.001	< 0.001
MRI	861 (100%)	834–887	1053 (100%)	1032–1075	348 (40%)	269–426	352 (33%)	293–411	231 (Week 14) (27%)	276 (week 13) (26%)	< 0.001	< 0.001
Nuclear Medicine	632 (100%)	599–665	439 (100%)	417–462	148 (23%)	125–171	113 (26%)	103–123	112 (Week 16) (18%)	90 (Week 18) (20%)	< 0.001	< 0.001

*CI, confidence interval. Average weekly imaging volume of weeks 1–9 was considered the volume baseline.Cl, column title.