Variations in volume of emergency surgeries and emergency department access at a third level hospital in Milan, Lombardy, during the COVID-19 outbreak

Castoldi, Laura; Solbiati, Monica; Costantino, Giorgio; Casiraghi, Elena

doi:10.1186/s12873-021-00445-z

Table 1 Mean daily access ± standard error, and the 95% bootstrap Studentized confidence interval, for each year and each category

From: Variations in volume of emergency surgeries and emergency department access at a third level hospital in Milan, Lombardy, during the COVID-19 outbreak

Period		1		2		3		4		Total
Period		Daily accesses (mean ± SE)	95% CI	Daily accesses (mean ± SE)	95% CI	Daily accesses (mean ± SE)	95% CI	Daily accesses (mean ± SE)	95% CI	Daily accesses (mean ± SE)	95% CI
Medicine	2019	78 ± 1.86	[73, 82]	79 ± 1.37	[76, 82]	76 ± 1.58	[73, 80]	76 ± 2.52	[69, 80]	77 ± 0.95	[75, 79]
	2020	62 ± 2.55	[58, 71]	42 ± 1.68	[39, 46]	40 ± 1.68	[37, 43]	45 ± 2	[41, 49]	46 ± 1.35	[43, 49]
	% drop	21 ± 3.35	[7, 26]	47 ± 0.86	[44, 48]	49 ± 1.32	[45, 51]	40 ± 0.8	[39, 42]	40 ± 1.34	[38, 43]
Surgery	2019	30 ± 1.49	[27, 33]	28 ± 1.18	[25, 31]	28 ± 0.95	[26, 30]	28 ± 1.25	[26, 32]	29 ± 0.59	[27, 30]
	2020	14 ± 1.88	[8, 17]	5 ± 0.59	[3, 6]	3 ± 0.35	[3, 4]	11 ± 0.76	[9, 12]	8 ± 0.66	[6, 9]
	% drop	56 ± 2.51	[51, 62]	85 ± 0.7	[83, 86]	88 ± 0.53	[87, 89]	63 ± 1.45	[58, 65]	74 ± 1.61	[71, 78]
Spec. examinations	2019	64 ± 2.4	[59, 71]	65 ± 1.97	[61, 69]	63 ± 2.62	[58, 68]	62 ± 3.55	[53, 69]	63 ± 1.41	[61, 66]
	2020	12 ± 1.74	[8, 15]	3 ± 0.51	[1, 4]	3 ± 0.31	[2, 3]	5 ± 0.5	[4, 6]	5 ± 0.55	[4, 6]
	% drop	81 ± 2.33	[76, 87]	96 ± 0.35	[95, 97]	96 ± 0.28	[95, 96]	92 ± 0.58	[91, 93]	92 ± 0.77	[91, 94]
Psychiatry	2019	5 ± 0.44	[4, 5]	4 ± 0.44	[3, 5]	4 ± 0.38	[4, 5]	5 ± 0.67	[3, 6]	4 ± 0.24	[4, 5]
	2020	3 ± 0.37	[2, 4]	2 ± 0.37	[1, 2]	1 ± 0.2	[1]	2 ± 0.31	[1, 3]	2 ± 0.16	[1, 2]
	% drop	34 ± 7.03	[20, 52]	50 ± 4.11	[43, 69]	74 ± 2.46	[69, 79]	65 ± 3.83	[54, 71]	60 ± 2.38	[56, 66]
Domestic Violence	2019	29 1.93 ± 0.29	[1.1, 2.47]	36 2.57 ± 0.6	[0.52, 3.61]	51 1.70 ± 0.26	[0.83, 2.21]	24 1.33 ± 0.26	[0.36, 1.68]	140 1.75 ± 0.17	[1.34, 2.18]
	2020	22 1.38 ± 0.27	[0.75, 2.04]	5 0.36 ± 0.16	[0.05, 0.61]	8 0.27 ± 0.09	[0.04, 0.45]	22 1.22 ± 0.26	[0.51, 1.52]	57 0.70 ± 0.11	[0.54, 0.86]
	% drop	24 −160 ± 183.04	[−427.48, 4673.33]	90 86 ± 2.04	[82.41, 91.2]	80 85 ± 1.66	[80.96, 89.48]	10 10 ± 8.92	[− 10.19, 31.67]	60 55 ± 4.38	[47.45, 62]
Deaths	2019	4 0.27 ± 0.11	[0, 0.41]	5 0.36 ± 0.16	[0.01, 0.59]	8 0.27 ± 0.09	[0, 0.40]	6 0.33 ± 0.13	[0, 0.48]	23 0.29 ± 0.06	[0.04, 0.46]
	2020	6 0 .38 ± 0.15	[0, 0.62]	19 1.36 ± 0.32	[0.54, 2.02]	27 0.90 ± 0.16	[0.54, 1.06]	16 0.89 ± 0.18	[0.44, 1.29]	68 0.84 ± 0.1	[0.57, 1.02]
	% raise	50 89 ± 50.37	[− 239.76, 167.64]	280 348 ± 78.77	[187.93, 522.51]	238 332 ± 48.04	[196.93, 428.47]	167 248 ± 55.27	[106.99, 360.31]	196 259 ± 26.77	[172.36, 311.65]

Since 2020 is a leap year, we averaged the accesses on February 28, 2019 and February 29, 2020, so that for both the years the whole period contains 80 days
With regard the Domestic Violence and the Deaths categories, due to few events, we report both the number of events in the whole period (bold character), and the mean daily events (and their CI). Similarly, we computed the percentage variation both by using the whole number of events and by averaging the daily raise percentages (where values equals to zero for days in 2019 were substituted by the value 0.1 to avoid division by zero)

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