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

  1. 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?
  1. Ecologic Fallacy
  2. Exclusion (selection) bias
  3. Confounding
  4. Recall (information) bias
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Answer #1

The correct option is (b) Exclusion (selection) bias.

It is because in exclusion bias, some patients are excluded from trials or analyses. This is a type of selection bias, in which the sample for study involves inclusion of individuals, groups in a way that proper randomization is not been achieved. And there is a prior bias in selecting a particular group for a study such that the results of the experiment are also biased.

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