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Duration since last HPV shot: Recoded years

Codes and Frequencies

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For female sample adults age 18 to 64 who received a vaccine for human papilloma virus (HPV) and could not recall the date of the last shot or selected "years ago" for time since last shot (HPVACLTP), HPVACLYR is a recoded variable that reports the time in categories of years since the woman received her last HPV shot.

Women who did not know the month or year are not-in-universe for HPVACLYR, but could have responses coded in the "time period" format, which reports the time in number (HPVACLNO) and units of days, weeks months or years (HPVACLTP).

This variable was first introduced in the 2010 Cancer Control Supplement.

Related variables

Questions about the HPV vaccine were also asked in 2008, with the interviewer introducing HPV-related questions by asking about awareness of the HPV virus (HPVHEAR).

Please use the IPUMS NHIS drop down menu and search functions for other related variables.



There are no comparability issues.


  • 2010: Female sample adults age 18-64 who have received an HPV shot/vaccine.


  • 2010