Fig. 1

Annual HPV Vaccination Uptake From 2006 to 2016 Among 9- to 26-Year-Olds of the United States: a. Females and b. Males. The annual uptakes are calculated as the percentage of enrollees of same age and sex who had a first claim for an HPV vaccine during the year. The colors in the graph depict the uptake pattern observed over time with colors transitioning from red to green as uptake values get higher. Each year, subjects turning between 9 and 26 years old are included (in 2006, enrollees born between 1980 and 1997, and in 2016, subjects are born between 1990 and 2007). Each column provides the annual uptakes by subjects’ year of age as determined by year of birth (in 2006, the 9–10-year-old subjects are those turning 10 during the year, i.e. the 1996 newborns). Birth cohort annual uptake estimates are found on decreasing diagonals. For example, 0.5 and 5.6% of enrollees born in 1997 initiated HPV vaccination in 2007 and 2016, respectively