In 1990, a case-control study was conducted to investigate the positive relationship between artificial sweetener use...

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In 1990, a case-control study was conducted to investigate the positive relationship between artificial sweetener use...

In 1990, a case-control study was conducted to investigate the positive relationship between artificial sweetener use and bladder cancer. Controls were excluded from being in the study if they had any obesity-related condition. Which one of the following biases likely occurred?

Ecologic Fallacy
Exclusion (selection) bias
Confounding
Recall (information) bias

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Answer 1

Answer #1

Ecologic Fallasy refers to dat collected at group level are applied at individual level

Exclusion bias refers to selection of particular people who are intended for the research and others are excluded .Here not all participants are equally balanced.Here the controls are excluded because of obesity related conditions

Confounding :The effects between exposure and outcome are distored by a variable

Recall bias is a systemic errors here participants cannot remember or forget previous things and generally a lot of omissions are done

Ans.b.Exclusion (selection ) bias

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Answer 2

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In 1990, a case-control study was conducted to investigate the positive relationship between artificial sweetener use...

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