BSTOLDYR 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 who ever had a blood stool test during an office visit, BSTOLDYR reports the year of the most recent office blood stool test.
In 2015, the wording of the question asking whether respondents had ever had a blood stool test during an office visit BSTOEV changed slightly to more inclusive language. Prior to 2015, respondents were asked whether they ever had "a blood stool test" in which a doctor or other health care professional collected a stool sample during an office visit. Beginning in 2015, the language was expanded to "a blood stool or FIT test".
- 2000; 2005; 2010; 2015: Sample adults age 40+ who ever had office blood stool test.
- 2000, 2005, 2010, 2015
- 2000, 2005, 2010, 2015 : SAMPWEIGHT