A study of the dropout rates in longitudinal research on aging and the prediction of death.
D000368:Aged; D000375:Aging; D001290:Attitude; D003643:Death; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D008297:Male; D008875:Middle Aged; D011581:Psychological Tests; D012924:Social Conditions; D013223:Statistics as Topic; D014705:Verbal Behavior