QuestionSBA
QuestionChoice
Incorrect - Attrition bias is the systematic difference between groups in the loss of participants from the study.
10008339
e
Attrition bias
QuestionChoice
Incorrect - Length time bias argues that slowly developing, asymptomatic diseases are those that are most likely to be detected in a screening programme. They are also associated with a better prognosis. This therefore exaggerates the efficacy of a screening programme, as it is these slowly developing diseases that are detected by them. Length time bias is a common type of bias within screening research, but is not relevant to the methodology described here.
10008336
b
Length Time Bias
QuestionChoice
Correct - Recall bias is the systematic difference in recall about a potential exposure by cases versus controls. Recall bias is a commonly found bias within case-control studies. Utilising the patient's medical records minimises the risk of incorrect information being obtained when collecting data.
10008335
a
Recall Bias
QuestionChoice
Incorrect - Overdiagnosis is understood to be the correct diagnosis of a disease, but one that is clinically irrelevant as the disease will never cause symptoms within the patient's lifetime. Overdiagnosis is an ethical problem, particularly in screening programmes. It is not relevant to the research methodology described here.
10008338
d
Overdiagnosis
QuestionChoice
Incorrect - Lead time bias states that screening will alter the time at which a diseases is detected. Through screening, a disease may be detected earlier before the patient begins showing symptoms. This therefore exaggerates the efficacy of a screening programme. It is not relevant to the methodology described here.
10008337
c
Lead Time bias
Concept
Chapter
2693
4470
Selection Bias
Topic
178
Medical Statistics
14214
A group of researchers are examining the correlation between depression and the development of cancer later in life. Rather than asking participants to report whether they have ever been diagnosed with depression, researchers took the history of depression from medical records.

Which of the following types of bias is minimised through this approach?
a