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Description
For sample persons age 18 years and older who have ever donated blood (BLOODGAVEV) and have donated blood since March 1985 (BLOODGAVE85), BLOODGAV85NO reports the number of times the sample person has donated blood since March 1985.
Comparability
There are no comparability problems with BLOODGAV85NO.
Universe
1990: Sample persons age 18+ who have ever donated blood and have donated blood since March 1985.
