CTCOLLDYR is a 4-digit-numeric variable.
0: Not in universe
9996: Time period format
9998: Unknown-not ascertained
9999: Unknown-don't know
For sample adults aged 40 years and older who ever had a CT colonography or virtual colonoscopy (CTCOLEV) and who chose to respond in month/year format, CTCOLLDYR reports the calendar year of the respondent's most recent CT colonography or virtual colonoscopy. CTCOLLDYR should be used alongside CTCOLLDMO, which reports the month of most recent CT colonography or virtual colonoscopy.
For more information, please see CTCOLEV.
- 2010; 2015; 2018: Sample adults age 40+ who have had a CT colonography or virtual colonoscopy.
- 2010, 2015, 2018
- 2010, 2015, 2018 : SAMPWEIGHT