Completion of the human papillomavirus (HPV) vaccine series among males with private insurance between 2006 and 2009.

Little is known about initiation and completion among males who received the HPV vaccine on an off-label basis before 2009. This study utilized administrative claims data from a private insurance company to examine completion of the 3 dose HPV series among 514 males who initiated the vaccine between 2006 and May of 2009. Frequencies of HPV vaccination were examined and multivariate logistic regression estimated the odds of completing the entire series within 365 days of initiation. We found that only 21% of male initiators completed all 3 vaccine doses within 12 months and completion decreased over time. Series completion did not vary significantly by provider type. These findings suggest that difficulties may be encountered in fully vaccinating enough males to achieve adequate herd immunity in the future.