Biases in the assessment of colorectal cancer screening programmes using hemoccult.


Many reports of screening programmes using the 'Hemoccult' faecal occult blood test have been published recently. Falsely optimistic results in such short term or nonexperimental studies can be caused by three biases of method: the lead-time bias, the length bias, and the volunteer bias. Their mechanisms, and methods for counteracting their effects are… (More)


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