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. 2021 May 19;14(5):e010413. doi: 10.1161/CIRCINTERVENTIONS.120.010413

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© 2021 American Heart Association, Inc.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure 3. — Predicted vs expected number of transcatheter aortic valve replacement (TAVR) and surgical aortic valve replacement (AVR) procedures per month. A, Temporal plot of the observed and expected number of TAVR/surgical aortic valve replacement (SAVR) procedures per month. B, The difference between the observed and expected number of TAVR/SAVR procedures per month. In both plots, the expected monthly count is estimated from a negative binomial model fitted to the 2017 to 2019 data. The vertical dotted line denotes March 23, 2020 (date of UK lockdown), with March 1 denoted by the vertical dashed line. AVR indicates aortic valve replacement; and CABG, coronary artery bypass graft.