Description
For sample persons age 17 to 64 who have ever give or sold to a blood bank, hospital, Red Cross, or somewhere else (BLOODGAVYR), BLOODGAVYRS reports how long it has been since the sample person last gave or sold blood. Possible responses were 1-90 years, as well as "Less than 1 year", "Less than 5 years", "5-10 years", "More than 10 year", and "Unknown interval".
