CTCOLLDYR 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 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.

Comparability

Aside from the imposition of a top code in 2018, there are no comparability issues. In 2018, the earliest year reported in CTCOLLDYR was limited to 84 years before the current year.

Universe

Availability

• 2010, 2015, 2018

Weights

• 2010, 2015, 2018 : SAMPWEIGHT