In epidemiology, information bias is bias arising in a clinical study because of misclassification of the level of exposure to the agent or factor being assessed and/or misclassification of the disease or other outcome itself.[1] It is a type of bias that occurs when measurement of information (e.g. exposure or outcome) differs among study groups,[1] that is, there are non-comparable information sources, or, in other words, bias due to an object of a study influencing the nature, precision and completeness of the study data collected about that object.
For example: a distorted and imprecise case history may be obtained from those with incipient demential memory loss, potentially biasing the search for external causes of dementia.
|
|||||||||||
|
|
Wikis
Search