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Age at first menstrual period: Flag for reasonable values

Codes and Frequencies

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For sample female adults age 18 and older, MENARCHFLAG reports whether the reported age when the respondent had her first menstrual period (MENARCH) is a reasonable value (categorized as menses onset between the ages of 9 and 17). Menses onset before age 9 or after age 17 are flagged as potentially unreasonable values.

MENARCHFLAG 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).


  • 1987