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Bias (Epidemiology)

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Definition: Any deviation of results or inferences from the truth, or processes leading to such deviation. Bias can result from several sources: one-sided or systematic variations in measurement from the true value (systematic error); flaws in study design; deviation of inferences, interpretations, or analyses based on flawed data or data collection; etc. There is no sense of prejudice or subjectivity implied in the assessment of bias under these conditions.  do not use for "bias" as prejudice or subjectivity (   
Examples Observer Variation; Selection Bias 		Other names Bias; Systematic Bias; Statistical Bias; Outcome Measurement Errors; Ecological Bias; Bias, Systematic; Bias, Statistical; Bias, Ecological; Bias, Aggregation; Aggregation Bias; Outcome Measurement Error; Errors, Outcome Measurement; Error, Outcome Measurement; Biases, Truncation; Bias, Truncation; Truncation Biases; Truncation Bias; Statistical Biases; Fallacy, Ecological; Fallacies, Ecological

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Sources: NLM Medical Subject Headings, NIH UMLS, Drugs@FDA, FDA AERS original data copyright United States Government. No endorsement implied. Last modified 6/6/2012
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