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Time since last CT colonoscopy: Time period

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For sample adults aged 40 years and older who ever had a CT colonoscopy or virtual colonoscopy (CTCOLEV) and who chose to respond in time period format, CTCOLLTP reports the time period (in days, weeks, months, or years) corresponding to the units since the respondent had their most recent CT colonoscopy or virtual colonoscopy. CTCOLLTP should be used alongside CTCOLLNO, which reports the number of time units (how many days, weeks, months, or years).

For more information about CT colonoscopy or virtual colonoscopy variables, please see CTCOLEV.


There are no comparability issues.


  • 2010; 2015; 2018: Sample adults age 40+ who have had a CT colonography or virtual colonoscopy and answered in number and time period format.


  • 2010, 2015, 2018