Potential acceptance of HPV vaccination at ages 9–10 in the United States among parents of HPV vaccine-naïve children

< .001); they were more concerned about side effects (42% vs 25%) and less worried it would encourage their children to be sexually active (9% vs 22%). Most parents in the undecided cohort reported they would definitely have accepted the HPV vaccination (52% vs 36%) if their child's provider had offered it when their child was younger, compared to parents who planned to refuse. Introducing HPV vaccine at an earlier age may be associated with increased parental acceptance specifically among those children who had not yet received HPV vaccination.