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Length of time used birth control pills: Over or under 1 year

Codes and Frequencies

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For female sample adults ages 18 and older who have ever used birth control pills, BCPILL1YR reports whether the total time that the respondent used birth control pills was less than one year or one year or more.

BCPILL1YR was first introduced in 1987 as part of a supplement on cancer epidemiology. For related variables, please use the IPUMS NHIS search function or drop-down menus.


There are no comparability issues with this variable.


  • 1987: Half of female sample persons age 18+ (excluded from CACT supplement) who ever used birth control pills.


  • 1987