Selective attrition - choice When the unhealthy members of a sample die out,the scores of the survivors seem to "rise" even though they may not change in reality.This research problem in studies on aging is referred to as:

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Selective attrition describes the phenomenon where healthier members of a sample are more likely to continue to participate in a study, while less healthy members drop out or die. This can bias the results of the study, as the scores of the remaining participants may appear to improve when in reality it is just that the unhealthy members are no longer included in the sample. Thus, selective attrition is the most appropriate term to use in this scenario.

Selective Attrition - Choice When the Unhealthy Members of a Sample