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Table 4 Persistence rates per event (event 1 is the first persistent infection with a vaccine /cross-protective type, event 2 is the second persistent infection, with at least one negative observation in between type-specific persistent infections, event 3 is the third persistent infection, with at least one negative observation in between type-specific infections)

From: Measuring vaccine effectiveness against persistent HPV infections: a comparison of different statistical approaches

Vaccination Status Event Cases Person time PR per 100 PY PRR per 100 PY
Vaccine types (HPV16/18)
Unvaccinated 1 51 3792 1.35 (1.02–1.77) Ref
2 5 95 5.26 (2.19–2.64) 3.91 (1.56–9.80)
3 0 17   
Vaccinated 1 3 4100 0.07 (0.02–0.23)  
2 0 4   
3 0 0   
 Cross-protective types (HPV31/33/45)
Unvaccinated 1 34 3813 0.89 (0.64–1.25) Ref
2 3 60 5.00 (1.61–15.50) 5.61 (1.72–18.26)
3 0 6   
Vaccinated 1 14 4082 0.34 (0.20–0.58)  
2 0 60   
3 0 0   
  1. PR = persistence rate, PRR = persistence rate ratio, py = person years