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Trends in routine HPV vaccination within ages 9 to 12 years, NIS-Teen, 2008–2018. HPV-UTD was defined as receiving at least 2 shots of HPV vaccine. Vaccination status between ages 9 to 12 years was derived by using NIS-Teen variables that accounted for age (in days, months, and years) at receipt of HPV shots. These data were not available for years 2008–2010.
