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Time since last colonoscopy: Grouped year estimate

Codes and Frequencies

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For sample adults aged 40 years and older who ever had a colonoscopy (COLEV), and who did not give the date of the most recent procedure or who selected years ago in the time period format, COLLESTY reports the number of years since the respondent's last colonoscopy in grouped years.

For more information, please see COLEV.


There are no comparability issues.


  • 2010; 2013; 2015; 2018: Sample adults age 40+ who have had a colonoscopy and for whom the date of most recent colonoscopy was unknown, or who selected years for the time period format for duration since last colonoscopy.


  • 2010, 2013, 2015, 2018