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Bias

QuestionAnswer
Selection Bias Nonrandom assignment to study groups(Berkson's Bias)
Recall Bias Knowledge of presence of disorder alters recall by subjects.
Sampling Bias Subjects are not representative relative to general population; therefore, results are not generalizable.
Late-Look Bias Information gathered at inappropriate time.
Procedure Bias Subjects in different groups are not treated the same.
Confounding Bias Occurs with 2 closely associated factors; the effect of 1 factor distorts or confuses the effect of the other.
Lead-time Bias Early detection confused with increased survival; seen with improved screening (natural history of disease is not changed, but early detection makes it seem as though survival increases).
Pygmalion effect Occurs when a researcher's belief in the efficacy of a treatment changes the outcome of that treatment.
Hawthorne effect Occurs when the group being studied changes its behavior owing to the knowledge of being studied.
Created by: davidallenf19
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