Table 2 Estimated crude and adjusted incidence rate reduction of covid-19-related hospitalization for each exposure.

From: Comparing COVID-19-related hospitalization rates among individuals with infection-induced and vaccine-induced immunity in Israel

Immunity status

Person-days of follow-up

Events

Incidence rate

Crude estimatea

Adjusted estimatea

Non-recent vaccine immunity (≥5 months from Second Vaccine)

72,914,787

766

0.0000105

Reference

Boosted vaccine immunity

143,612,328

213

0.0000015

86% (84–88%)

89% (87–91%)

Infection-induced immunity

9,759,128

26

0.0000027

75% (63–83%)

66% (50–77%)

Enhanced infection-induced immunity

9,266,031

22

0.0000024

77% (65–85%)

75% (61–83%)

  1. aCrude and adjusted estimates of the reduction in incidence rate as compared with the reference, calculated as 1−IRR.
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