A simplified flowchart of the compartmental model including the main compartments and transitions.

<p>The scheme is stratified by 100 one-year age-classes and replicated by 3 sexual activity levels. U: sexually inactive women; UV: sexually inactive, vaccinated women; X: sexually active, susceptible women; Y: women with HPV infection; CIN1–CIN3: women with cervical intraepithelial neoplasia, grades 1–3; CIS: women with carcinoma in situ; CC: women with cervical cancer; Z: immune women; V: vaccinated women; HX: hysterectomized susceptible women; HY: hysterectomized women with HPV infection; HZ: hysterectomized immune women; VH: vaccinated, hysterectomized women; U_m: sexually inactive men; X_m: sexually active, susceptible men; Y_m: men with HPV infection; Z_m: immune men.