Extended Data Fig. 1: Characterizing the behaviour of the app. | Nature

Extended Data Fig. 1: Characterizing the behaviour of the app.

From: The epidemiological impact of the NHS COVID-19 app

Extended Data Fig. 1

a, The total number of app downloads and active users over time. Fluctuations in app users are artefactual, driven by reporting issues on Android handsets, such that the estimate of ‘active users’ is a lower bound estimate. b, The seven-day rolling mean of the total number of notifications triggered each day. c, The daily number of app users receiving a confirmed positive test. d, The daily number of app users recording a positive test result in the app, having recently received an exposure notification.

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