COLLDYR is a 4-digit numeric variable.

0: Not in universe
9996: Time period format
9997: Unknown-refused
9998: Unknown-not ascertained
9999: Unknown-don't know

Description

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.

Comparability

Beginning in 2018, the earliest year reported in COLLDYR was limited to 84 years before the current year. Otherwise, this variable is comparable over time.

Universe

Availability

• 2010, 2013, 2015, 2018

Weights

• 2010, 2013, 2015, 2018 : SAMPWEIGHT