All::Clinical Science::Study Design::Bias
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What is meant by bias in study design?
A situation in a trial where one outcome is systematically favoured
BiasWhat is Selection bias?
Error in assigning individuals to groups leading to differences which may influence the outcome
BiasWhat is Recall bias?
Difference in the accuracy of the recollections retrieved by study participants, possibly due to whether they have disorder or not
BiasWhat is Publication bias?
Failure to publish results from valid studies, often as they showed a negative or uninteresting result.
BiasWhat is Work-up bias/verification bias?
clinicians may be reluctant to order the gold standard test unless the new test is positive, as the gold standard test may be invasive
BiasWhat is Expectation bias?
Observers may subconsciously measure or report data in a way that favours the expected study outcome
BiasWhat is the Hawthorne effect?
Describes a group changing it's behaviour due to the knowledge that it is being studied
BiasWhat is Late-look bias?
Gathering information at an inappropriate time
BiasWhat is Procedure bias?
Occurs when subjects in different groups receive different treatment
BiasWhat is Lead-time bias?
where early diagnosis of a disease falsely makes it look like people are surviving longer
Bias