Comparability
This variable is comparable across survey years, despite some changes in response codes and question wording.
Beginning in 2005, response codes for "Follow up test of an earlier test/screening exam" and "Family history" were collapsed into "Other." Otherwise, response codes are consistent across time.
In 2015, the wording of the question asking whether respondents had ever had a home blood stool test BSTHEV changed slightly to more inclusive language. Prior to 2015, respondents were asked whether they ever had "a blood stool test, using a HOME test kit?" Beginning in 2015, respondents were asked whether they had ever had "a blood stool or FIT test, using a HOME test kit?"
