Figure 1: Estimates of survival probabilities of oncogenic HPV and any HPV for the HIV/CD4 strata from semiparametric and nonparametric additive hazard model fitting with the other covariates held at reference values: age < 30, race is white, never smoked, and one male sexual partner in past 6 months: (a) oncogenic HPV; (b) any HPV. From top to bottom for each outcome and each model fit: HIV−, CD4 > 500, CD4: 200–500, and CD4 < 200.