Search results
Results from the WOW.Com Content Network
Lead time bias happens when survival time appears longer because diagnosis was done earlier (for instance, by screening), irrespective of whether the patient lived longer. Lead time is the duration of time between the detection of a disease (by screening or based on new experimental criteria) and its usual clinical presentation and diagnosis ...
Length time bias in cancer screening. Screening appears to lead to better survival even when actually no one lived any longer. Length time bias (or length bias) is an overestimation of survival duration due to the relative excess of cases detected that are asymptomatically slowly progressing, while fast progressing cases are detected after giving symptoms.
Length time bias leads to better perceived survival with screening, even if the course of the disease is not altered. Many screening tests involve the detection of cancers. Screening is more likely to detect slower-growing tumors (due to longer pre-clinical sojourn time) that are less likely to cause harm.
The five-year survival rate is a type of survival rate for estimating the prognosis of a particular disease, normally calculated from the point of diagnosis. [1] Lead time bias from earlier diagnosis can affect interpretation of the five-year survival rate.
This area of study must contend with problems of lead time bias and length time bias. Lead time bias is the concept that early diagnosis may artificially inflate the survival statistics of a cancer, without really improving the natural history of the disease.
President Donald Trump will sign an executive order establishing a new Justice Department task force to "end the war on Christians."
Get breaking Finance news and the latest business articles from AOL. From stock market news to jobs and real estate, it can all be found here.
Get breaking news and the latest headlines on business, entertainment, politics, world news, tech, sports, videos and much more from AOL