Bias

**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.

**Tree numbers:** - N05.715.350.150 - N06.850.490.500

**Synonyms:** - Bias, Epidemiologic - Epidemiologic Biases - Biases