A systematic review published in Academic Emergency Medicine gathered all the research on physicians that measured implicit bias with the Implicit Association Test and included some assessment of clinical decision making. Most of the nine studies used vignettes to test what physicians would do in certain situations.
The majority of studies found an implicit preference for white patients, especially among white physicians. Two found a relationship between this bias and clinical decision making. One found that this bias was associated with a greater chance that whites would be treated for myocardial infarction than African-Americans.
This study was published in 2017.
The Implicit Association Test has its flaws. Although its authors maintain that it measures external influences, it’s not clear how well it predicts individual behavior. Another, bigger systematic review of implicit bias in health care professionals was published in BMC Ethics, also in 2017. The researchers gathered 42 studies, only 15 of which used the Implicit Association Test, and concluded that physicians are just like everyone else. Their biases are consistent with those of the general population.
The researchers also cautioned that these biases are likely to affect diagnosis and care.
A study published three years earlier in the Journal of the American Board of Family Medicine surveyed 543 internal medicine and family physicians who had been presented with vignettes of patients with severe osteoarthritis. The survey asked the doctors about the medical cooperativeness of the patients, and whether they would recommend a total knee replacement.