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Time since last colonoscopy: Grouped year recode 1 (2000 method)

Codes and Frequencies

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For sample adults aged 40 years and older who ever had a colonoscopy (COLEV), COLLGYRR1 is a recoded variable that reports the time since the respondent's most recent colonoscopy using the same method as the 2000 survey. There is a similar version COLLGYRR2 using method as the 2005 survey.


This recoded variable is based on the following variables:

COLLNO Time since last colonoscopy: units
COLLTP Time since last colonoscopy: time period
COLLDMO Calendar month of last colonoscopy
COLLDYR Year of last colonoscopy
COLLESTY Time since last colonoscopy: grouped year estimate

The 2010 and 2015 Cancer Layout file notes that, "This is a time category recode for the time since the most recent colonoscopy. This variable uses the same information collected in 2000 and 2003, and the same estimation method used in 2000."

For more information, please see COLEV.


There are no comparability issues.


  • 2010; 2013; 2015: Sample adults age 40+ who have had a colonoscopy.


  • 2010, 2013, 2015