Codes and Frequencies
For sample adults aged 40 years or older, COLEV indicates whether the respondent ever had a colonoscopy.
Beginning in 2019, the variable COLSIGEV indicates whether or not the person had a colonoscopy or sigmoidoscopy. IPUMS NHIS staff constructed COLSIGEV for 2010, 2013, 2015, and 2018 using information from SIGEV and COLEV to have a comparable indicator for whether someone had a colonoscopy or sigmoidoscopy.
The survey form directed interviewers to read if necessary, "A polyp is a small growth that develops on the inside of the colon or rectum. Before these tests, you are asked to take a medication that causes diarrhea."
According to the 2010 and forward Field Representative's Manual, this and related questions were asked:
The 2010 and forward Manual further provided the following definition for cancer:
The Manual also provided the following statement regarding how the data from the Cancer Screening questions would be used:
The 2015 sample layout file provides the following explanation:
- 2010; 2013; 2015; 2018: Sample adults age 40+.
- 2010, 2013, 2015, 2018
- 2010, 2013, 2015, 2018 : SAMPWEIGHT