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. 2021 Aug 2;597(7876):404–409. doi: 10.1038/s41586-021-03843-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Kaplan–Meier curves tracking the percentage of participants in the holdout arm (blue) (n = 18,749) versus the follow-through reminder arm (red) (n = 74,605) of the first RCT who had obtained the first dose of COVID-19 vaccine at UCLA Health by a given day from the first reminder date (0 on the x axis) onward. All participants were right-censored at 55 days after the first reminder date. The solid horizontal line indicates that 18.38% of participants in the holdout arm had obtained the first dose at UCLA Health by the end of 55 days after the first reminder date.