A recent study found that screening for disease X led to increased survival.In the study,those who were screened were generally younger,healthier,and more aware of their health than those who were not screened.This makes it hard to evaluate whether the improvement in survivorship was due to the screening program or due to the characteristics of those who are screened.What is the name of this issue when evaluating the effect of a screening program?

A) Lead time bias
B) Overdiagnosis bias
C) Selection bias
D) Misclassification bias
E) Length-biased sampling

Question

Zybrea Knight · Accepted Answer

Final Answer : C, Explanation :  Selection bias is an important issue to consider when evaluating the effectiveness of screening programs.Usually,participants of a screening program are healthier than the general population,and therefore it becomes hard to assess whether the screening program was effective or whether the characteristics of those who participate in it make it seem effective.

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