Lead time bias is the bias that occurs when two tests for a disease are compared, and one test (the new, experimental one) diagnoses the disease earlier, but there is no effect on the outcome of the disease—it may appear that the test prolonged survival, when in fact it only resulted in earlier diagnosis when compared to traditional methods. It is an important factor when evaluating the effectiveness of a specific test.
Read more about Lead Time Bias: Relationship Between Screening and Survival
Famous quotes containing the words lead, time and/or bias:
“If this bureau had a prayer for use around horse parks, it would go something like this: Lead us not among bleeding-hearts to whom horses are cute or sweet or adorable, and deliver us from horse-lovers. Amen.... With that established, let’s talk about the death of Seabiscuit the other night. It isn’t mawkish to say, there was a racehorse, a horse that gave race fans as much pleasure as any that ever lived and one that will be remembered as long and as warmly.”
—Walter Wellesley (Red)
“There is time enough for everything, in the course of the day, if you do but one thing at once; but there is not time enough in the year, if you will do two things at a time.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)
“The solar system has no anxiety about its reputation, and the credit of truth and honesty is as safe; nor have I any fear that a skeptical bias can be given by leaning hard on the sides of fate, of practical power, or of trade, which the doctrine of Faith cannot down-weigh.”
—Ralph Waldo Emerson (1803–1882)