The usual time to death after diagnosis of disease X is 2 years.A screening program allows for the early detection of disease X,on average 1 year earlier than the usual diagnosis; however,there is no available treatment even in early stages of disease X.With the screening program it seems like the time to death has increased to 3 years; however,this is only due to the early diagnosis thanks to the screening program.What is the name of the issue previously described?

A) Timing bias
B) Survival bias
C) Selection bias
D) Confounding
E) Lead-time bias

Lead-Time Bias

A bias in screening tests that occurs when the detection of a disease at an early stage artificially seems to increase the survival time without actually affecting the course of the disease.

Early Diagnosis

The process of detecting a disease or condition at an early stage, allowing for more effective management and treatment outcomes.

Screening Program

is a public health service in which members of a defined population, who do not necessarily perceive they are at risk of a disease or its complications, are asked a question or offered a test, to identify those individuals who are more likely to be helped than harmed by further tests or treatment to reduce the risk of a disease or its complications.