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Table 2 Effectiveness of anti-HBV vaccine, incidence ratio (IR) and 95% confidence interval (CI)

From: Effectiveness of DNA-recombinant anti-hepatitis B vaccines in blood donors: a cohort study

Cohort

HBV cases

Total follow-up (person-years)

Person-years at risk*

Incidence per thousand person-years

IR (95% CI)

Vaccinated

0

2747

2715

0.00

0 (0.000, 0.696)

Non-vaccinated

4

1725

1717

2.33

1.000 **

  1. * see methods section for calculation details
  2. ** reference category