The aims of this study were to determine the percentage of females who after initiating the human papillomavirus (HPV) vaccine series, both completed it and completed it on-time, as well as to examine factors associated with series completion and on-time completion. Using data from the North Carolina Immunization Registry, of 138,823 females analyzed, 55% completed the series, and 28% completed it on-time. Over 83% of those who initiated the vaccine series in 2006 completed it by the final study date, as compared to 32% of those who initiated the vaccine in 2009. On-time dosing rates, however, are declining, and have been hovering at 25% for the last two years of the study. Factors such as African-American race and public funding were significantly associated with lower rates of on-time dosing as well as series completion when compared to White race and private funding, respectively. Among girls and young women who initiate the HPV vaccination series, overall completion rates are low, but if given enough time most of those who begin the series will complete it. Our results suggest that strategies to improve the timely completion of the HPV vaccination series may be needed.

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