title: Development of a test of cognitive bias in medical decision making.
abstract: OBJECTIVE
  To develop an inventory to measure the influence of cognitive biases on medical decisions.
  
  
  METHODS
  The Inventory of Cognitive Biases in Medicine (ICBM) consists of 22 medical scenarios in which respondents choose between alternatives that represent bias-prone or statistically based decisions. In 1992 and 1993 the ICBM was administered to 102 medical students and residents and 318 physician faculty at the Wright State University School of Medicine.
  
  
  RESULTS
  The statistically correct decision was made in fewer than half the ICBM scenarios for both groups (students and residents, 41%; faculty, 49%); and only the faculty scored better than chance. Acceptable reliability (KR 20 = .62 for the faculty administration) and item discrimination (mean = .49) were achieved. Further, the results suggest that the ICBM has both content and construct validity.
  
  
  CONCLUSIONS
  The rather poor performances of the students and residents and the faculty on the ICBM suggest that cognitive biases constitute an important detraction from reliance on logical and statistical strategies. The ICBM shows promise for use as a tool in both instructional and research endeavors attempting to minimize and elucidate this phenomenon.
authors.affiliation: Department of Veterans Affairs Medical Center (DVAMC), Dayton, OH 45428.
authors.forename: P J
authors.initials: PJ
authors.lastname: Hershberger
authors.forename: H M
authors.initials: HM
authors.lastname: Part
authors.forename: R J
authors.initials: RJ
authors.lastname: Markert
authors.forename: S M
authors.initials: SM
authors.lastname: Cohen
authors.forename: W W
authors.initials: WW
authors.lastname: Finger
mesh_terms: D003071:Cognition; D003657:Decision Making; D011287:Prejudice; D015203:Reproducibility of Results