Fig. 2: Clearance of oral oncogenic HPV infections identified in the HIM study, stratified by age tertiles (age at first HPV detection) with and without transient infections.
From: Persistence and clearance of oral human papillomavirus among a multi-national cohort of men

Represented are number of infections, not number of men with an infection—men could have multiple infections. Kaplan–Meier curves with log-rank test investigated. A Clearance of an incident oral oncogenic HPV infection, stratified by age group; B Clearance of an incident oral oncogenic HPV infection, stratified by age group, excluding transient infections; C Clearance of a prevalent oral oncogenic HPV infection, stratified by age group; D Clearance of a prevalent oral oncogenic HPV infection, stratified by age group (excluding transient infections).