Berkson's bias

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A form of selection bias that causes hospital cases and controls in a case control study to be systematically different from one another because the combination of exposure to risk and occurrence of disease increases the likelihood of being admitted to the hospital. This produces a systematically higher exposure rate among hospital patients, so it distorts the odds ratio. The bias was described by the American statistician Joseph Berkson (1899–1982).

Subjects: Public Health and Epidemiology.

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