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  Indian J Med Microbiol
 

Figure 1: Lead time bias. X-axis represents time in years. Two scenarios, namely where the disease is diagnosed in the usual clinical situation (after the occurrence of symptoms; top) and when the disease is diagnosed by screening (bottom), have been compared. Even though there is no real change in survival following early detection of disease by screening, the perceived duration of survival is increased, due to a lead time effect

Figure 1: Lead time bias. X-axis represents time in years. Two scenarios, namely where the disease is diagnosed in the usual clinical situation (after the occurrence of symptoms; top) and when the disease is diagnosed by screening (bottom), have been compared. Even though there is no real change in survival following early detection of disease by screening, the perceived duration of survival is increased, due to a lead time effect