Here is a list of all Biases in the Catalogue. Check back regularly as we are adding new ones over time.
Systematic differences between groups in how outcomes are determined.
Individuals differ in their geographic, temporal and economic access to diagnostic procedures which label them as having a given disease.
Knowledge of a subject’s prior exposures or personal biases may influence both the process and the outcome of diagnostic tests.
When not all participants receive the same reference test in a diagnostic accuracy study.
When individuals modify an aspect of their behaviour in response to their awareness of being observed.
When a topic is fashionable (‘hot’) investigators may be less critical in their approach to their research, and investigators and editors may not be able to resist the temptation to publish the results.
When the results of an index test form part of the reference test in a diagnostic study.
A tendency for the methods and results of a study to support the interests of the funding organisation.
Bias that arises from systematic differences in the collection, recall, recording or handling of information used in a study.
The presence of a person’s information in an electronic health record is affected by the person’s health status.
The use of an insufficiently accurate method to detect the outcome of interest, such that clinically important differences are not detected.
The lack of concealment of an intervention or control treatment received by participants in a clinical trial.
Publication of research findings in a particular language.
An innocent exposure may become suspicious if, rather than causing disease, it causes a benign disorder which resembles the disease.
Occurs when a study participant is categorised into an incorrect category altering the observed association or research outcome of interest.