Control for additional factors to minimize the bias caused by them in the study.

University of Michigan - Ann Arbor

Also called admission-rate bias, refers to the fact that people with more than one conditions are more likely to be admitted than people with just one condition. This increases the likelihood of the chosen risk factor to be present - which causes an overrepresentation in the hospital sample.

Berkson Bias

Sutton-Tyrrell, K. (1991). Assessing bias in case-control studies. *AHA Journals*. 22(7),  938-939 from [www.ahajournals.org/doi/pdf/10.1161/01.STR.22.7.938 .](https://www.ahajournals.org/doi/pdf/10.1161/01.STR.22.7.938 .) 

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