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. 2020 Mar 11;222(6):948–956. doi: 10.1093/infdis/jiaa099

Figure 2.

Figure 2.

Prevalence reduction of human papillomavirus (HPV) types 18/31/33 in unvaccinated 18-year-old females by birth cohorts (1992–1995) and vaccination strategy: (Arm A) gender-neutral (49% girls and 23% boys HPV vaccinated [P for trend .0005]); (Arm B) girls-only (47% girls vaccinated [P for trend .092]); (Arm C) control, hepatitis B virus vaccination (P for trend .447) at the age of 12–15 years in 2007–2010. The trend of reduction by birth cohorts in the gender-neutral Arm A was stronger than that of the girls-only Arm B (P = .0556) or control Arm C (P = .0015).