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Time since home blood stool test: Grouped years

Codes and Frequencies

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For sample adults over age 40 who ever had home blood stool or FIT test (BSTHEV), this variable indicates the time, in grouped years, since the person's last home blood stool test.

Prior to 2019, BSTHGYRR was collected periodically as part of a series of cancer screening questions. Beginning in 2019, BSTHGYRR is collected every other year as part of a rotating core set of NHIS survey content covering preventive screening services. Please refer to the BSTHEV description for a list of related variables covering blood stool or FIT tests.


Prior to 2019, this variable is completely comparable over time. The NHIS questionnaire was substantially redesigned in 2019 to introduce a different data collection structure and new content. For more information on changes in terminology, universes, and data collection methods beginning in 2019, please see the user note.


  • 2000; 2003: Sample adults age 40+ who ever had home blood stool test(BSTHEV).
  • 2019; 2021: Sample adults age 40+ who ever had a home blood stool or FIT test (BSTHEV).


  • 2000, 2003, 2019, 2021