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Table 2 Number of subjects needed to vaccinate (NNV) to prevent one woman from being infected by human papillomavirus (HPV) 16/18 by age 35

From: Upscaling human papillomavirus vaccination in high-income countries: impact assessment based on transmission model

Vaccination option NNV Ratio
11-year-old girls only, coverage 65 1.5 Reference category
11-year-old girls only, coverage 90% 1.5 1.0
11-year-old girls and boys, coverage 65% 2.7 1.8