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Time since last colonoscopy: Time period

Codes and Frequencies

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For sample adults aged 40 and older who ever had a colonoscopy (COLEV) and who chose to respond in time period format, COLLTP reports the time period corresponding to the units (in days, weeks, months, or years) since the respondent had their colonoscopy. COLLNO reports the number of such time units (how many days, weeks months or years ago) since the respondent had their colonoscopy. These two variables should be used together.

The survey form directed interviewers to, "Enter time period for time since most recent colonoscopy."

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 answered in number and time period format.


  • 2010, 2013, 2015, 2018