Berkson's bias

Berkson's bias

a type of selection bias which may occur in case-control studies which are based entirely on hospital studies.
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Also, another reason for selecting some of control patients from other wards was removing Berkson's bias (11).
In addition, avoidance of Berkson's bias tended to lower the RR.
Methodologic strength in definition of exposure and avoidance of Berkson's bias are both inversely related to RR in the case-control studies.