Do correlates of HPV vaccine initiation differ between adolescent boys and girls?

► We assessed HPV vaccine initiation in a population-based sample of adolescents. ► Only 14% of boys had initiated HPV vaccine compared to 44% of girls. ► For both sexes, initiation correlated with age and use of meningococcal vaccine. ► For boys, initiation correlated with lower income and non-black/non-white race. ► For girls, initiation was associated with public school attendance.