For sample adults over age 40 who ever had a home blood stool test, except for those for whom the date of the exam unknown, BSTHMOR reports the time since the last home blood stool test in months.
Comparability
This variable has no comparability issues.
Universe
2000; 2003: Sample adults age 40+ who ever had home blood stool test, except for those for whom the date of the exam unknown.
