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. 2021 Feb 24:NEJMoa2101765. doi: 10.1056/NEJMoa2101765

Figure 1. Study Population and Cohort Enrollment Process, December 20, 2020, to February 1, 2021.

Figure 1

The 1,503,216 persons vaccinated before February 1, 2021, were also required to be without a documented SARS-CoV-2 PCR-positive result before the vaccination date. Absolute numbers and percentage changes are shown for each inclusion and exclusion criterion. The exclusion process was gradual and occurred in phases; persons could have had more than one reason for exclusion. The same exclusion criteria were applied to the unvaccinated persons for each index date in which they were considered for matching. The chart focuses on the vaccinated population. CHS denotes Clalit Health Services.