b6-lead-time-illusion {ctfepi}sealed case file

Lead Time Illusion

Case B6, The MarkerDiagnostic Accuracy and Screeningscene 5insane800 pts

Case

Corvane sells a cardiac blood test alongside Velquor, and the city wants to screen every dockworker over 50.

What this scene will ask

A screening program lengthens survival from diagnosis without changing mortality.

Planned flag: the dominant bias, from lead time, length, and overdiagnosis; mean lead time in years, 2 dp; number of overdiagnosed cases; apparent gain in five year survival from diagnosis, 3 dp.

Status

[#] Sealed. This scene opens when it is written and passes review. Nothing on CTFEpi expires, so there is no rush.