Figure 3From: Anal and oral human papillomavirus (HPV) infection in HIV-infected subjects in northern Italy: a longitudinal cohort study among men who have sex with men Result of multivariate logistic analysis. According to the final model, the probability of anal HPV infection is plotted versus the CD4 count. In order to take account of the patients' ages, three separate lines are depicted corresponding to representative age points. The 25th percentile corresponds to an age of 34 years, the 50th percentile (median) to 42 years, and the 75th percentile to 50 years.Back to article page