Question

Systematic error due to differences between those selected for a study and those not selected is:...

Systematic error due to differences between those selected for a study and those not selected is:

- confounding

-information bias

-loss to follow-up

-interaction

-selection bias

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Answer #1

Ans- Selection bias

(A selection bias comes from any error in selecting the study participants and/or from factors affecting the study participation. As a consequence, the relationship between exposure and disease differs between those included in the study and those potentially eligible for the study.Selection bias also occurs when people volunteer for a study.Selection bias is a distortion in a measure of association (such as a risk ratio) due to a sample selection that does not accurately reflect the target population.This biases the study when the association between a risk factor and a health outcome differs in dropouts compared with study participants.)

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