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Time since office blood stool test: Estimated years

Codes and Frequencies

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For sample adults who ever had a blood stool test during an office visit, but did not know the date of the most recent exam, or knew it was more than one year (for 2010 and forward), BSTOLGYRE reports the person's estimated number of years (in grouped years) since the most recent office blood stool test.


Apart from minor changes in the universe, there are no comparability issues with this variable.


  • 2000: Sample adults age 40+ who ever had office blood stool test and for whom the date of the exam was unknown.
  • 2010; 2015: Sample adults 40+ who have had an office blood stool test and REF/DK date of most recent office blood stool test or selected years ago for the time period format


  • 2000, 2010, 2015