Outcome Assessment Bias Definition. For example a doctor decides to give a critically ill child a new experimental medication that has a 50 chance of curing the childs condition. DOR can result in outcome reporting bias ORB when changes in outcomes occur after knowledge of results.
Assessment bias refers to qualities of an assessment instrument that unfairly penalize a group of students because of students gender race ethnicity socioeconomic status religion or other such group defining characteristics Popham 127. However we recommend that review authors limit the number of assessments used by grouping outcomesfor example as subjective or objective for the purposes of assessing blinding of outcome assessment or as patient reported at 6 months or patient reported at 12 months for assessing risk of bias due to incomplete outcome data. Both study-level entries such as allocation sequence concealment and outcome specific entries such as blinding.
Outcome bias is a problem because it leads us to repeat poor decision making based on outcomes rather than on the process used to obtain the outcome.
Problems with the comparability of participants or populations in a study selection bias. Problems with measurement or classification of exposure or outcomes detection bias. DOR can result in outcome reporting bias ORB when changes in outcomes occur after knowledge of results. Outcome Bias is the tendency to evaluate a decision on the basis of its outcome rather than on what factors led to the decision.