Ensure accurate data collection and risk factor ascertainment. If not possible, *select* features keeping in mind the biasing factor(s).

University of Michigan - Ann Arbor

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Incomplete ascertainment of risk factor in control group leads to underrepresentation of the factor, and an inaccurate study.

Ascertainment 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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