Table 2.

Mechanical thrombectomy overall and monthly volumes immediately before and during the COVID-19 pandemic

	Overall volume				Monthly volumea
	N	n1	n2	Change	N	Immediately before	During COVID-19	p
				% (95%CI)		Adjusted mean (SE)
Overall	176	5191	4533	−12.7 (−13.6 – −11.8)	173	10.9 (1.3)	9.8 (1.3)	<0.0001
Hospital COVID-19 volumeb
Low	44	952	869	−8.7 (−10.7 – −7.1)	44	11.2 (3.6)	10.5 (3.5)	0.044
Mid	45	1370	1232	−10.1 (−11.8 – −8.6)	45	11.7 (1.2)	10.8 (1.2)	0.004
High	45	1602	1273	−20.5 (−22.6 – −18.6)	46	7.8 (2.2)	5.7 (2.2)	<0.0001
Hospital MT volumec
Low	59	459	412	–10.2 (–13.4 – –7.8)	60	2.6 (0.36)	2.3 (0.36)	0.082
Mid	55	1294	1092	–15.6 (–17.7 – –13.7)	55	8.1 (0.46)	7.0 (0.50)	0.0002
High	58	3432	3029	−11.7 (−12.9 – −10.7)	58	18.8 (1.8)	16.8 (1.7)	0.0002

N: number of hospitals; n1: number of procedures immediately before COVID-19 pandemic; n2: number of procedures during COVID-19 pandemic; CI: confidence interval; SE: standard error; MT: mechanical thrombectomy.

The n1 is based on three months before (December 2019–February 2020) COVID-19 pandemic.

^aThe monthly volume analysis is adjusted for peak COVID-19 volume for each country and the continent.

^bp: low vs. mid = 0.259; low vs. high ≤ 0.0001; mid vs. high ≤ 0.0001.

^cp: low vs. mid = 0.004; low vs. high = 0.345; mid vs. high = 0.0003.