Bias in Radiology Resident Selection: Do We Discriminate Against the Obese and Unattractive? : Academic Medicine

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Bias in Radiology Resident Selection: Do We Discriminate Against the Obese and Unattractive?

Maxfield, Charles M. MD; Thorpe, Matthew P. MD, PhD; Desser, Terry S. MD; Heitkamp, Darel E. MD; Hull, Nathan C. MD; Johnson, Karen S. MD; Koontz, Nicholas A. MD; Mlady, Gary W. MD; Welch, Timothy J. MD; Grimm, Lars J. MD

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Academic Medicine 94(11):p 1774-1780, November 2019. | DOI: 10.1097/ACM.0000000000002813
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To evaluate for appearance-based discrimination in the selection of radiology residents.


A deception study simulating the resident selection process examined the impact of attractiveness and obesity on resident selection. Seventy-four core faculty from 5 academic radiology departments reviewed mock residency applications in September and October 2017. Each application included demographic information and a photograph, representing a prespecified distribution of facial attractiveness and obesity, combined with randomized academic and supporting variables. Reviewers independently scored applications for interview desirability. Reviewer scores and application variables were compared using linear mixed fixed- and random-effects models.


Reviewers evaluated 5,447 applications (mean: 74 applications per reviewer). United States Medical Licensing Examination Step 1 scores were the strongest predictor of reviewer rating (B = 0.35 [standard error (SE) = 0.029]). Applicant facial attractiveness strongly predicted rating (attractive vs unattractive, B = 0.30 [SE = 0.056]; neutral vs unattractive, B = 0.13 [SE = 0.028]). Less influential but still significant predictors included race/ethnicity (B = 0.25 [SE = 0.059]), preclinical class rank (B = 0.25 [SE = 0.040]), clinical clerkship grades (B = 0.23 [SE = 0.034]), Alpha Omega Alpha membership (B = 0.21 [SE = 0.032]), and obesity (vs not obese) (B = −0.14 [SE = 0.024]).


Findings provide preliminary evidence of discrimination against facially unattractive and obese applicants in radiology resident selection. Obesity and attractiveness were as influential in applicant selection for interview as traditional medical school performance metrics. Selection committees should invoke strategies to detect and manage appearance-based bias.

The tendency to attribute traits and abilities to individuals based on their physical appearance is well documented.1,2 It starts early in life3,4 and is seen across cultures.5 Unattractive people are perceived to be less intelligent, less socially skilled, and less successful than more attractive individuals.1,6 Obese individuals are vulnerable to similar stereotypes, including perceptions that they are unmotivated, undisciplined, and unintelligent.7 Such stereotypes can lead to prejudice and discrimination, as has been demonstrated in social,8 medical,9 legal,10 political,11,12 and occupational13,14 contexts.

The effects of appearance-based bias have been extensively studied in the occupational domain, where it has been shown that unattractive individuals, compared with more attractive individuals, are less likely to be hired and are offered lower starting salaries, among several negative job-related outcomes.14 Empirical evidence of weight-based discrimination in the workplace is even more robust: The obese encounter disadvantages in hiring decisions,13 compensation,15 and promotion.16

It might be expected that a similar bias would affect the admissions/selection process in higher education. While obesity (but not facial unattractiveness) has been shown to be associated with lower educational attainment,17 and obese high school students are less likely to attend college,18 there is little empiric evidence to attribute this to weight-based discrimination in the admissions process. Nor have any studies, to our knowledge, found evidence of discrimination in higher education admissions based on facial attractiveness.

The requirement for a photograph in graduate medical education (GME) applications introduces the potential for bias based on physical attributes19 and presents an opportunity to study the impact of applicants’ physical appearance on the selection process. In this study, we carried out a simulated resident selection process in which core faculty at 5 academic radiology departments reviewed and scored fictitious residency applications, believing they were evaluating actual applicants as part of their department’s resident selection process. Our goal was to evaluate for appearance-based discrimination in the selection of GME residents to radiology residency.



Volunteers were solicited from the core faculty of 5 geographically diverse academic radiology departments (Duke University, University of Indiana, Mayo Clinic, University of New Mexico, and Stanford University) to review applications under the guise of resident application screening. This is the same pool of faculty from which our programs draw each year when help is needed in applicant screening and interviews, but faculty involved in actual resident application screening during the concurrent application cycle were excluded from the study. Demographic summary data aside from gender were not collected for participating faculty, to ensure anonymity given the sensitive nature of the research question.

Ethics statement

The institutional review boards (IRBs) at the 5 participating institutions exempted or approved this study, which used deception of subjects. The 3 institutions that approved the study granted waiver of consent.


We created mock applications to model the Electronic Residency Application Service (ERAS).20 Each application consisted of 1 of 76 fixed baseline identities, anchored by the application photograph, combined with randomized academic and supporting variables (Table 1). The 76 baseline identities were fixed with a distribution of gender, race/ethnicity, facial attractiveness, and obesity variables, which was chosen to reflect the distribution of actual radiology applications, but with overrepresentation of certain groups to maximize statistical power. We randomized academic variables important in the selection of radiology applicants for interview (preclinical class rank, clinical clerkship grades, Alpha Omega Alpha [AOA] Honor Society membership, and quantity of research publications)21,22 for each application and reviewer, such that each reviewer saw a different combination of academic variables associated with any given photograph. Additional supporting variables (common volunteer activities and characteristic premedical accomplishments), deemed noninfluential in the selection process (by 3 experienced residency program directors), were randomized to each application to increase realism. Personal statements, Medical School Performance Evaluations (MSPE, Dean’s Letter), letters of recommendation, specific publication citations, United States Medical Licensing Exam (USMLE) Step 2 scores, and additional advanced degrees were not included in these abbreviated applications.

Table 1:
Definitions of Study Variables Used in Simulated Resident Selection at 5 Academic Radiology Departments, From a Study of Potential Bias Against Obese and Unattractive Applicants, 2017


We standardized 170 open-access/stock color photographs from the Internet into the format typical for residency applications, featuring full front view of the head and shoulders of a professionally dressed individual. Photographs featuring a range of attractiveness and obesity, varying by gender and race/ethnicity, were sought. No photographs contained any identifying information, and no photographs were familiar to any of the reviewers. A panel of 8 radiologists, chosen to reflect the demographic distribution of the core radiology faculty of the 5 departments (4 male, 4 female; 5 white, 2 Asian, 1 African American; age range, 26–56), subjectively rated the obesity and facial attractiveness of each photograph. Obesity was rated from 0 to 2 (0 = not obese; 1 = mildly obese; 2 = very obese). Facial attractiveness was rated from 1 to 5 (1 = extremely unattractive; 2 = unattractive; 3 = neutral; 4 = attractive; 5 = extremely attractive). We selected photographs based on mean ratings and narrow interrater variability. Intraclass correlation coefficient for attractiveness was 0.73 (95% confidence interval, 0.68, 0.78); for obesity, it was 0.87 (0.84, 0.90). The final 76 photographs were selected to acquire the desired diversity of gender (53% male, 47% female), race/ethnicity (35% white, 32% Asian, 29% black, 4% Hispanic), facial attractiveness (22% more attractive, 43% neutral, 34% less attractive), and obesity (52% not obese, 48% obese). For analysis, applicants were binned into 3 attractiveness groups: “less attractive,” “neutral,” and “more attractive,” and into obese and nonobese groups using natural breaks in the data (i.e., nadirs of the histogram between peaks in trinomial distributions of attractiveness and obesity), with further binning of attractive and obese groups together. Preliminary analysis validated that effect estimates and correlation coefficients were similar using these bins compared with continuous mean attractiveness and obesity. Accordingly, we present data using bins for simplicity.


The 76 baseline identities that comprised the application pool were presented to reviewers through a “.org” website built using PHP version 5.6.30 (Zend Technologies, Cupertino, California) and MySQL version 5.1.73 (Oracle Corporation, Redwood Shores, California) deployed through a commercial shared server on We designed the website to convincingly model the ERAS website. A unique, randomly generated 6-character identifier, encoded only for site and reviewer gender, was embedded in a URL provided to each reviewer by a site-specific investigator (T.S.D., D.E.H., C.M.M., G.W.M., T.J.W.). On following the link, this identifier was encrypted via a one-way salted hashing algorithm through the PHP CRYPT_SHA512 function. Only the resulting one-way hash was stored in the database, such that ratings from reviewers following their original, unique link could be obtained over multiple sessions; however, reviewer identities could not be decrypted by the website developer/statistical analyst (M.P.T.) to protect reviewers’ anonymity. The website randomly generated academic variables unique for each reviewer. These algorithm-generated variables were stored in the database, along with the reviewer’s ratings of each applicant.


We carried out the experiment in September and October 2017, consistent with the pretense that reviewers were contributing to their department’s actual concurrent resident application screening process. The 5 site-specific investigators (1 current program director, 1 immediately past program director, 2 vice chairs of education, and 1 departmental chairman) sent emails to each member of their core faculty seeking volunteers to screen residency applications. Those faculty who responded were sent a link to the reviewer website, which presented the 76 applications in random order. Reviewers were told that applications were abbreviated for efficient review, but contained information sufficient for screening. Each was asked to review at least 50 applications and to score each application from 1 (“least desirable for interview”) to 5 (“most desirable for interview”). We told reviewers that their score would be 1 of 2 or 3 generated for each applicant, with the cumulative score used to determine interview decisions. To encourage a holistic approach, reviewers were given minimal instructions and provided only with a benchmark range of USMLE Step 1 scores (230–260) described as “typical for our program.” We asked reviewers not to discuss individual applicants until the process was complete and assured them their scores would be confidential. After completion of the study, all participants were debriefed in accordance with requirements of the IRBs of the 5 participating sites.

Statistical analysis

Statistical analysis was performed using the R statistical programming language version 3.4.3, including lme4 package version 1.1.14. (R Foundation for Statistical Computing, Vienna, Austria). We modeled applicant ratings using linear mixed effects, with random intercepts to mitigate ceiling and floor effects resulting from an individual reviewer tending to rate applicants closer to 5 or closer to 1, and random slopes to account for heterogeneous individual reviewer value placed on various parameters. The initial model included 5-way interaction terms for reviewer gender, applicant gender, applicant race/ethnicity, obesity, and attractiveness. Only the obesity–attractiveness interaction was significant; other interaction terms were removed from the final analysis one at a time in backwards fashion based on the Bayesian information criterion. On preliminary analysis, scores for black and Hispanic applicants trended together, so we combined these as “underrepresented minorities,” given the proportionately smaller sample of Hispanic base identities. For the purposes of analysis, published and submitted peer-reviewed manuscripts had similar influence and were combined; poster presentations were not influential, and we omitted these from the final statistical model. Cumulative performance on core clinical clerkships was quantified as the sum of 0 for each pass, 1 for each high pass, and 2 for each honors grade.


Of the 90 core faculty at the 5 institutions who responded to a request for volunteers, 74 followed the provided link and reviewed the mock applications (range of 7–30 reviewers at each institution). Reviewers (37 female, 37 male) evaluated an average of 74 applications (range, 23–76); 88% (n = 65) completed all 76 applications and 97% (n = 72) completed at least 75% of applications. On a scale from 1 to 5, reviewers gave applicants a mean score of 3.5 (standard deviation [SD] = 1.0), with mild leftward skewness of −0.4. The average rating given by each reviewer ranged from 2.2 to 4.4, and the random intercept term modeling reviewer-specific ratings explained 17% of the total variability in ratings. Mixed-model adjusted values were normally distributed with mean 3.0 (SD = 0.4), without significant residual error across reviewers. No institutional differences in ratings were demonstrated.

Table 2 reports demographic distribution of the 5,447 randomly generated residency applications that were reviewed. Table 3 demonstrates the relative influence of academic and nonacademic variables on reviewer ratings. USMLE Step 1 score was the strongest predictor of ratings, with a 10-point change in Step 1 score predicting a change of 0.35 in the reviewer-adjusted rating. Expressed as a standardized regression coefficient, a 1-SD increase in Step 1 score predicted a reviewer-adjusted rating 1.2 SDs higher. The applicant’s facial attractiveness strongly predicted ratings for attractive versus unattractive (B = 0.30 [standard error (SE) = 0.056]) and neutral versus unattractive (B = 0.13 [SE = 0.028]). Applicant race was strongly associated with ratings. Reviewers at participating institutions preferred black and Hispanic applicants relative to white (B = 0.25 [SE = 0.059]) or Asian (B = 0.28 [SE = 0.023]) applicants. There were no significant interactions of race with gender, obesity, or attractiveness. Traditional medical school performance metrics were predictive of reviewer scores, including preclinical class rank (B = 0.25 [SE = 0.040] for first vs third quartile), clinical clerkship grades (B = 0.23 [SE = 0.034] for top vs lowest tertile), and AOA membership (B = 0.21 [SE = 0.033]). Obese applicants received lower scores compared with otherwise equivalent nonobese applicants (B = −0.14 [SE = 0.024]).

Table 2:
Demographic Distribution of 5,447 Randomly Generated Residency Applications Reviewed in Simulated Radiology Resident Selection Experiment at 5 Academic Radiology Departments, From a Study of Potential Bias Against Obese and Unattractive Applicants, 2017
Table 3:
Relative Influence of Academic and Nonacademic Variables on Faculty Reviewer Ratings of Mock Residency Applicants at 5 Academic Radiology Departments, From a Study of Potential Bias Against Obese and Unattractive Applicants, 2017

Collectively, the randomized academic variables (USMLE Step 1 score, clinical clerkship grades, preclinical class rank, AOA membership, and total number of research publications) accounted for 34% of the variability in ratings (Table 3). Race/ethnicity explained 6% of the variability in ratings, and the physical appearance of the applicant (facial attractiveness and obesity) explained 5%.

Figure 1 depicts reviewer-adjusted ratings for each combination of weight and attractiveness. The interaction term for obesity * attractiveness was −0.03 (P < .001), indicating that obese applicants derived less benefit from being facially attractive than did nonobese applicants. Figure 1 also depicts the proportion of applicants in each category of obesity and attractiveness falling into the bottom 85% of applicants, an empirical threshold based on the participating residency programs interviewing approximately 15% of applicants. According to this analysis, an attractive, nonobese applicant is 14% more likely to be invited for an interview than is an equivalent unattractive, obese applicant. Figure 1 also demonstrates how obesity neutralizes much of the benefit of facial attractiveness: Obese applicants who were facially attractive were only slightly more likely to clear the 85th percentile threshold for interview than were obese applicants who were less attractive. The benefit of facial attractiveness was significantly greater for nonobese applicants.

Figure 1:
Distribution of application ratings from simulated residency selection process at 5 academic radiology departments, from a study of potential bias against obese and unattractive applicants, 2017. Ratings are on a scale of 1–5, by obesity and attractiveness, adjusted for individual reviewer average ratings using a mixed random-intercepts model. The horizontal line reflects the 85th percentile for ratings across all groups; values below this threshold would not be expected to receive an invitation for interview, based on our participating institutions’ empirical invitation rates. Percentages along the bottom of the plot represent the group-specific rejection rates. Mean ratings and rejection rates demonstrate a significant linear benefit of attractiveness among nonobese applicants (P < .01 with Holm adjustment for multiple comparisons) but an attenuated, nonsignificant benefit of attractiveness among obese applicants.


Our findings demonstrate significant relationships between the physical appearance of applicants and the decision to grant interviews in the setting of GME. Across the spectrum of race, gender, and academic achievement, there was a clear pattern of discrimination against facially unattractive and obese applicants.

In our simulated residency selection process involving core faculty from 5 different radiology programs, the facial attractiveness of an applicant, as presented by the application photograph, was more influential in selection for interview than were well-established medical school performance metrics such as preclinical class rank, clinical clerkship grades, AOA membership, and quantity of research publications, all of which have been shown to be among the most important factors in the selection of radiology applicants for interview.23 While not as influential as facial attractiveness, obesity was on par with most academic metrics. Furthermore, our findings demonstrate a statistically significant interaction between facial attractiveness and obesity, such that, assuming a 15% threshold for recommendation for interview (the average of the 5 participating residency programs), an applicant who is obese and facially unattractive is 14% less likely to receive an interview than is an applicant who is nonobese and facially attractive, according to our model.

Our study builds on similar work in the business literature demonstrating improved hiring rates for attractive individuals, but few studies have explored this phenomenon in the higher education admissions process. No published studies, to our knowledge, have demonstrated discrimination in admissions based on the facial attractiveness of applicants, but 2 studies found evidence for weight-based discrimination. In 1966, Canning and Mayer showed that obese students were less likely to be accepted into elite colleges,24 and more recently, Burmeister and colleagues demonstrated that applicants with a higher body mass index were less likely to be offered a position in a graduate psychology program.25

The design of our study, which simulated the actual resident selection process through deception of the application reviewers, allowed us to control for several confounding variables present in prior studies. By using a single photograph as a surrogate for attractiveness, we were able to isolate the physical features of the applicant and eliminate confounders that might otherwise manifest in the admissions process. In Burmeister and colleagues’ study, personal interviews were used to evaluate the influence of applicant obesity on admissions decisions, but this methodology failed to control for indirect factors known to be correlates of obesity, such as self-confidence and interpersonal skills.26 Canning’s methodology, a retrospective review of admission data, is similarly plagued by confounders that correlate with obesity and facial unattractiveness, such as letters of recommendation,27 extracurricular activities,26 and grades.28 This problem was avoided in our study by use of fictitious applicants, the randomization of all academic variables, the exclusion of letters of recommendation, and the inclusion of only noninfluencing extracurricular activities and premedical accomplishments.

Although it was not the primary focus of the study, we also evaluated the influence of race and gender. Applicant race was strongly influential on reviewer rating, as reviewers favored black and Hispanic applicants over white and Asian applicants. We do not consider our results inconsistent with recent studies that show implicit antiblack bias in doctors29 and in a medical school admission committee,30 but rather our results illustrate that implicit bias may not be a reliable predictor of behavior and should not be presumed to be a surrogate for discrimination. We suspect that our reviewers were prioritizing applicants they believed best met institutional goals and values. Regarding applicant gender, published studies in the psychology and business literature suggest that the influence of physical appearance may be stronger for female applicants than for male applicants,31 but the results are inconsistent.32 We found no significant influence of applicant gender, reviewer gender, or their interaction.

We find no reason to believe that our findings are limited to radiology resident selection. Implicit antiobesity attitudes are widely held,33 and those held by health professionals34 may manifest behaviorally in clinical decision making.35 Unlike in business, where physical attractiveness has been shown to correlate with success,36 there is no justification in medicine for bias based on physical appearance. Resident selection committees should invoke strategies to detect and manage appearance-based bias. Existing diversity training programs should consider including, or emphasizing, education to counter appearance-based bias in their curricula. ERAS should reconsider the role of photographs in the application process.

This study has several limitations. We used deception to simulate the resident selection process, but there were differences in our applications, and in our application process, which might have resulted in our subjects behaving differently from actual reviewers of real applications. Our mock applications omitted important application factors (personal statements, letters of recommendation) for greater efficiency in review and to eliminate confounders; psychology research suggests that with less information, reviewers are more likely to rely on nonacademic factors.37 Our reviewers might have weighed certain academic or nonacademic factors differently from those primarily responsible for application screening during the concurrent application cycle, or from those reviewers with more experience in the task. We attempted to compensate for this by including only core faculty with experience in evaluating residency or fellow applicants. Only volunteer activities and premedical accomplishments felt to be noninfluential by 3 experienced program directors were included in the applications, but it is possible that individual supporting variables might have influenced certain reviewers. Limited demographic data were collected for subjects, to ensure anonymity given the sensitive nature of the research question, and to maintain compliance with our waiver of consent. The attractiveness and obesity of applicants were determined by a panel of radiologists. A larger panel, or one with a different composition of members, might have rated photographs differently. We attempted to compensate for this by choosing applicant photographs with narrow interrater variability. Assessment of physical attractiveness is subjective and may be subject to cultural and social forces.38,39 Photographs were used as a static cue for obesity. This simplifies and may underestimate the influence of obesity. To maximize statistical power, certain demographic groups were over- or underrepresented in our study. Females accounted for only 29% of applications to radiology programs in 201740 but comprised 47% of applicants in our experiment. Blacks accounted for just 6% of applicants to radiology programs in 2017 but in our experiment accounted for 29%. Obese applicants were overrepresented in our simulated application pool, in the subjective opinion of our experienced program directors.

In conclusion, our study provides preliminary evidence for discrimination against facially unattractive and obese applicants in admissions to GME radiology residency programs. We hope these findings raise the awareness of admissions decision makers as to the potential influence of appearance-based bias. We recommend that ERAS reconsider the role of photographs in the GME application process.


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