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Time since last colonoscopy: Number of units

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, COLLNO reports the number of time units (how many days, weeks, months, or years ago) since the respondent had their most recent colonoscopy. COLLTP reports the type of time period (days, weeks, months, or years) and should be used together with COLLNO.

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