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. Author manuscript; available in PMC: 2021 Oct 1.
Published in final edited form as: Nat Med. 2021 Mar 10;27(4):626–631. doi: 10.1038/s41591-021-01292-y

Extended Data Fig. 1. Study inclusion criteria.

Extended Data Fig. 1

Individuals reporting symptoms for at most 1 day were considered for the purpose of this analysis to be asymptomatic. We further excluded users who joined the app already unhealthy, for which the onset of disease was not calculable. Of the remainder, we excluded those who only reported intermittent unhealthy report and restricted to individuals reporting prospective symptoms at least once a week over the course of the disease. The left side of the diagram represents the inclusion flowchart for individuals reporting a positive swab test while the right side reflects the inclusion flowchart for individuals with antibody positive test only.