COLLDYR 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 and older who had ever had a colonoscopy (COLEV), COLLDYR reports the year of the respondent's colonoscopy. COLLDYR should be used alongside COLLDMO, which reports the month of the most recent colonoscopy.
For more information about colonoscopy variables, please see COLEV.
- 2010; 2013; 2015; 2018: Sample adults age 40+ who have had a colonoscopy.
- 2010, 2013, 2015, 2018
- 2010, 2013, 2015, 2018 : SAMPWEIGHT