Biases

Here is a list of all Biases in the Catalogue.  Check back regularly as we are adding new ones over time.

 

Partial reference bias

When only a proportion of the study group receive both the index and reference standard test when investigating for diagnostic accuracy.

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Perception bias

The tendency to be subjective about people and events, causing biased information to be collected in a study or biased interpretation of a study’s results.

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Performance bias

Systematic differences in the care provided to members of different study groups other than the intervention under investigation

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Popularity bias

Differences in the uptake of healthcare as a result of a public interest in a disease or condition and its possible causes results in a biased study sample

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Previous opinion bias

The results of a previous assessment, test result or diagnosis, if known, may affect the results of subsequent processes on the same patient.

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Recall bias

Systematic error due to differences in accuracy or completeness of recall to memory of past events or experiences.

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Referral filter bias

Referral of any group of unwell people from primary to secondary to tertiary care, causing an increase in the concentration of rare cases, more complex cases or people with worse outcomes.

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Selection bias

occurs when individuals or groups in a study differ systematically from the population of interest leading to a systematic error in an association or outcome.

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Spectrum bias

Occurs when a diagnostic test is studied in a different range of individuals to the intended population for the test

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Spin Bias

The intentional or unintentional distorted interpretation of research results, unjustifiably suggesting favourable or unfavourable findings that can result in misleading conclusions

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