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Inconsistency flag for progestin replacement therapy

Codes and Frequencies

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For sample female adults who have ever taken estrogen and progestin AND who were ages 18-39, not pregnant, and had a menstrual period in the past three months that was less regular or lighter than a year ago OR who were age 40 and older, PROGEFLG reports whether there is an inconsistency between the age the respondent reported first taking progestin (PROGEAGE) and the time period reported. This variable was created because of apparent unlikely values reported for the age at which the respondent first started taking progestin. Researchers may wish to use caution with those values that are flagged.

PROGEFLG was first introduced in 1999. For related variables, please use the IPUMS NHIS search function or drop-down menus.


There are no comparability issues with this variable.


  • 1999: Female sample adults age 40+ who are not pregnant and female sample adults age 18 to 39 whose menstrual periods are less regular or whose menstrual flow is lighter than 12 months ago, and who have ever taken estrogen and progestin.


  • 1999