Imaging volumes during COVID-19: A Victorian health service experience

Table 5 Comparison of mean adult weekly imaging volumes for 2019 and 2020 including 95%CIs, by imaging modality categorised by patient setting

Adult Setting	Modality	2020			2019			P value
		Mean	Min-max	95%CI	Mean	Min-max	95%CI
Emergency	Angiography	4.05	1-10	3.38-4.71	5.03	2-12	4.51-5.56	0.02
	Computed tomography	541.2	384-663	520-562.4	548.68	473-606	541.7-555.7	0.453
	Fluoroscopy	5.18	1-12	4.31-6.05	4.15	0-11	3.58-4.72	0.042
	Radiography	1162.64	925-1309	1133.02-1192.25	1299.03	1156-1446	1281.05-1317.02	< 0.0001
	Magnetic resonance imaging	12.11	3-27	10.35-13.87	18.55	9-30	17.09-20.01	< 0.0001
	Nuclear Medicine	3.27	0-8	2.66-3.88	7.55	0-21	6.43-8.67	< 0.0001
	Ultrasound	122.98	85-157	117.52-128.43	172.13	116-255	163.72-180.55	< 0.0001
	Mammography	0	0-0	0-0	0.02	-0.02-0.05	0-0.1	0.394
Inpatient	Angiography	38.8	23-53	36.25-41.34	29.48	17-43	27.94-31.02	< 0.0001
	Computed tomography	408.05	277-498	392.38-423.71	298.87	210-416	285.57-312.16	< 0.0001
	Fluoroscopy	125.98	82-162	120.33-131.63	129.25	80-155	125.39-133.11	0.325
	Radiography	855.64	557-1015	824.02-887.25	794.77	685-968	779.87-809.67	0.0003
	Magnetic resonance imaging	123.09	74-158	117.84-128.34	100.65	67-132	97.32-103.98	< 0.0001
	Nuclear Medicine	21.64	8-37	19.76-23.52	20.92	12-35	19.68-22.15	0.507
	Ultrasound	325.82	215-395	314.29-337.35	264.22	192- 323	256.97-271.46	< 0.0001
	Mammography	0.7	0-7	0.3-1.1	1.87	0-10	1.3-2.43	0.002
	Bone mineral densitometry	1.41	0-5	0.97-1.85	1.6	0-5	1.27-1.93	0.479
Outpatient	Angiography	9.0	2-26	7.47-10.53	17.08	5-30	15.86-18.31	< 0.0001
	Computed tomography	249.86	107-333	234.48-265.25	313.7	139-367	302.61-324.79	< 0.0001
	Fluoroscopy	17.61	6-37	15.2-20.03	24.78	5-43	22.97-26.59	< 0.0001
	Radiography	268.02	120-473	246.82-289.23	427.12	147-507	410.57-443.66	< 0.0001
	Magnetic resonance imaging	268.09	98-414	249.76-286.43	347.6	108-401	335.36- 359.84	< 0.0001
	Nuclear medicine	50.84	19-88	46.88-54.8	71.72	31-112	68.14-75.3	< 0.0001
	Ultrasound	768.48	492-943	741.33-795.62	855.27	554-931	836.21-874.32	< 0.0001
	Mammography	15.82	2-24	14.2-17.44	17.75	8-23	16.87-18.63	0.027
	Bone mineral densitometry	36.77	4-72	301.13-42.42	50.9	0-72	47.57-54.23	< 0.0001
All classes	Angiography	51.84	30-70	48.58-55.11	51.6	30-63	49.76-53.44	0.892
	Computed tomography	1199.11	768-1458	1154.65-1243.58	1161.25	962-1339	1141.96-1180.54	0.090
	Fluoroscopy	148.77	96-205	141.2-145.35	158.18	92-184	153.59-162.78	0.027
	Radiography	2286.3	1602-2603	2214.97-2357.62	2520.92	2310-2718	2498.03-2543.80	< 0.0001
	Magnetic resonance imaging	403.30	175-556	380.71-425.88	466.8	200-526	452.6-481.0	< 0.0001
	Nuclear medicine	75.75	29-128	70.65-80.85	100.18	46-134	96.21-104.15	< 0.0001
	Ultrasound	1217.27	808-1491	1178.47-1256.08	1291.62	918-1429	1268.35-1314.88	.001
	Mammography	16.52	2-24	14.87-18.17	19.63	10-30	18.61-20.66	0.001
	Bone mineral densitometry	38.18	5-74	32.33-44.03	52.5	0-72	49.13-55.87	< 0.0001
	Total	5437.05	3520-6441	5250.9-5623.8	5822.68	4645-6175	5750.97- 5894.4	< 0.0001