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Bias in clinical trials (Trial design and preparation (Formulate clear…
Bias in clinical trials
Definition
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Deficiency in research design which has enabled systematic differences to exist in either the group characteristics, measurement, data collection or analysis
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Observer bias
Person responsible for data collection is unable to use their judgement as to whether an event has occurred or not
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Reporting/recall bias
A persons group identity influences their liklihood of accurately reporting previous experiences/outcomes (may be more likely to report events if they are expecting them)
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Hawthorne effect
The process of study may result in a more favourable outcome for those enrolled (e.g from the extra attention they receive)
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