BIAS and BLINDING

  • Bias can be eliminated by
  1. Matching
  2. Blinding
  3. Randomization
  • Recall bias is most commonly associated with Case control study
  • Susceptibility bias is eliminated by Randomization
  • Berkesonian bias is due to Different rates of admission to hospital due to different diseases
  • Interviewer bias can be reduced by allowing equal interview time
  • Selection bias in a study can be eliminated by Randomization
  • Berkesonian bias is a type of Selection bias
  • Basic types of biases in epidemiological study is Investigation bias & Subject bias
  • Addmision rate bias is Berkesonian bias
  • Problem of bias is maximum with Case control study
  • Matching is method to eliminate confounding bias. It is used in Case control study
  • Bias is unlikely to invalidate cohort studies used to assess risk of exposure because Exposure is usually determined prior to disease occurrence
  • Non - Bias study is Randomized controlled trials
  • Bias is Systemic error
  • Randomized study is done in people who are volunteer for the study may lead to Selection bias.
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