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Table 2 Pfizer vaccine efficacy overall and by subgroup [5]

From: The COVID-19 Vaccine and the Black Community: Addressing the Justified Questions

  1. *Surveillance time is the total time in 1000 person-years for the given end point across all participants within each group at risk for the end point. The time period for COVID-19 case accrual is from 7 days after the second dose to the end of the surveillance period
  2. †The confidence interval for vaccine efficacy is derived according to the Clopper-Pearson model, adjusted for surveillance time
  3. ‡Race or ethnic group was reported by the participants. “All others” included the following categories: American Indian or Alaskan Native, Asian, Native Hawaiian or other Pacific Islander, multiracial, and not reported