Research ArticleOriginal Research

Clinicians’ Implicit Ethnic/Racial Bias and Perceptions of Care Among Black and Latino Patients

Irene V. Blair, John F. Steiner, Diane L. Fairclough, Rebecca Hanratty, David W. Price, Holen K. Hirsh, Leslie A. Wright, Michael Bronsert, Elhum Karimkhani, David J. Magid and Edward P. Havranek
The Annals of Family Medicine January 2013, 11 (1) 43-52; DOI: https://doi.org/10.1370/afm.1442

Abstract

PURPOSE We investigated whether clinicians’ explicit and implicit ethnic/racial bias is related to black and Latino patients’ perceptions of their care in established clinical relationships.

METHODS We administered a telephone survey to 2,908 patients, stratified by ethnicity/race, and randomly selected from the patient panels of 134 clinicians who had previously completed tests of explicit and implicit ethnic/racial bias. Patients completed the Primary Care Assessment Survey, which addressed their clinicians’ interpersonal treatment, communication, trust, and contextual knowledge. We created a composite measure of patient-centered care from the 4 subscales.

RESULTS Levels of explicit bias were low among clinicians and unrelated to patients’ perceptions. Levels of implicit bias varied among clinicians, and those with greater implicit bias were rated lower in patient-centered care by their black patients as compared with a reference group of white patients (P = .04). Latino patients gave the clinicians lower ratings than did other groups (P <.0001), and this did not depend on the clinicians’ implicit bias (P = .98).

CONCLUSIONS This is among the first studies to investigate clinicians’ implicit bias and communication processes in ongoing clinical relationships. Our findings suggest that clinicians’ implicit bias may jeopardize their clinical relationships with black patients, which could have negative effects on other care processes. As such, this finding supports the Institute of Medicine’s suggestion that clinician bias may contribute to health disparities. Latinos’ overall greater concerns about their clinicians appear to be based on aspects of care other than clinician bias.

Key words

INTRODUCTION

Primary care clinicians serve as the cornerstone of the health care system and are required to possess many skills. Patient-centeredness is 1 of 6 key dimensions of high-quality health care,1 and if clinicians are to provide such care, they must be able to engage patients in a collaborative partnership.

The importance of the clinician-patient relationship is underscored by demonstrated links between the quality of the relationship and a number of processes and outcomes of care, including patients’ adherence to medical advice,2–6 decision to remain with a clinician,7 satisfaction with care,3 and clinical outcomes of care.3,8,9

Ethnic/racial minorities appear to be at a disadvantage in this aspect of health care.10–17 In addition to cultural and language barriers, there have been long-standing concerns that clinician bias may contribute to lower-quality clinical relationships.18,19

A 2003 report18 by the Institute of Medicine noted, “It is likely that the vast majority [of clinicians] endorse egalitarian and non-racist attitudes.”

But also, “[there is] strong but circumstantial evidence for the role of bias, stereotyping, prejudice, and clinical uncertainty” in the genesis of health disparities. The observation that clinicians are unlikely to directly express ethnic/racial bias yet may still deliver care that is influenced by unrecognized bias is consistent with research in social psychology that demonstrates that bias exists on explicit and implicit levels. Whereas explicit bias is overt and freely expressed, implicit bias may not be consciously acknowledged and operates in more subtle ways.20–22 For example, a clinician with implicit bias may unconsciously exhibit negative behavior or poor communication with a black patient, as has been shown in laboratory research.21,23–25 In addition to reducing the patient’s comfort and trust, such actions may impede the flow of information, lead to shorter interviews, and reduce the patient’s understanding of and resolve to follow medical advice.2–6,13 Few studies have directly investigated whether clinician bias is related to communication, interpersonal treatment, and trust in ongoing clinical relationships. In a prior study,26 we found that two-thirds of participating primary care clinicians showed some implicit ethnic/racial bias that favored whites, even as they rejected explicit expressions of bias. In the current study, we contacted a large sample of patients of those clinicians and asked them to rate the degree to which their clinicians were patient-centered during their interactions. We then examined those ratings as a function of the patients’ ethnicity/race and the clinicians’ implicit and explicit ethnic/racial bias. We hypothesized that clinicians with higher levels of implicit bias would be rated less favorably by their minority patients than clinicians with lower levels of implicit bias.

METHODS

Study Population and Data Collection: Clinicians

We derived data about the implicit bias of clinicians from a prior study26 in which adult primary care clinicians from 3 health care organizations were invited to complete measures of their implicit and explicit ethnic/ racial attitudes (N = 210, 60% participation rate). Data from that study were included in the present study for 2 organizations: Denver Health and Kaiser Permanente Colorado. Denver Health is an integrated safety-net health care system and is nationally recognized for its model of care to underserved, indigent, and minority patients.27,28 Denver Health community clinics see more than 100,000 unique patients each year (15% black, 60% Latino, 16% white, and 9% other). Kaiser Permanente Colorado is a closed-panel, group-model, not-for-profit health maintenance organization with approximately 480,000 members in the Denver area (5% black, 17% Latino, 74% white, and 4% other). The institutional review board for each institution approved the study design and procedures.

Implicit Bias

We measured implicit bias against blacks and against Latinos with 2 Implicit Association Tests (IATs).29 The IAT measures implicit bias29–32 by the speed with which a person can respond to a group and positive vs negative words. Implicit bias is shown, for example, if the person is significantly faster when black faces and negative words require the same response while white faces and good words require another response, compared with the reverse pairing. The larger this performance difference, the stronger the implicit bias for that person (demonstration is available at https://implicit.harvard.edu). The IAT has been widely used, and its psychometric properties and methodologic strengths and limitations have been extensively reviewed.30–34 The 2 IATs completed by the clinicians in this study were validated in previous research to measure implicit bias against blacks compared with whites and against Latinos compared with whites.26,35 Possible scores ranged from –2 to +2, with negative scores indicating bias against whites, positive scores indicating bias against blacks or Latinos, and 0 indicating no bias.

Explicit Bias

The clinicians were asked to indicate their explicit attitudes toward blacks, Latinos, and whites on 2 standard measures36,37: Feeling Thermometers (with possible scores of 0 to 100 for “cool” to “warm” feelings) and a set of semantic differential scales (7-point trait ratings of “hard-working to lazy,” “wise to foolish,” and “cooperative to hostile”).

Study Population and Data Collection: Patients

We obtained primary data from patients in a broader study on hypertension care; thus, all patients had diagnosed hypertension. Patients were included in the sampling frame for this study if they received regular care from a participating clinician and their ethnicity/race of record was black, Latino, or white. The patients were stratified by clinician and ethnicity/race, and then randomly selected within each stratum up to a maximum of 12 patients. This initial screening produced 7,437 patients, of whom 1,308 were subsequently determined to be ineligible for the study (1,055 had incorrect contact information, 210 did not confirm their primary care clinician, and 43 self-identified their ethnicity/race as other than any of the 3 groups included in this study).

A professional survey company attempted to call the 6,129 eligible patients by telephone and administer the questionnaire in either English or Spanish. If telephone contact could not be made, a written questionnaire in both English and Spanish was sent to the patient’s last known address. All participants were sent a $10 gift card.

Patient Survey

Four subscales were administered from the well-validated Primary Care Assessment Survey38 (PCAS): interpersonal treatment, communication, trust, and contextual knowledge. Example items include rating the clinician on “caring and concern for you” (interpersonal treatment), “you leave your doctor’s office with unanswered questions” (communication), “my doctor sometimes pretends to know things when really not sure” (trust), and “knowledge about you as a person (your values and beliefs)” (contextual knowledge). Each subscale is scored from 0 to 100, with higher scores indicating a higher level of the attribute; the 4 subscales were averaged to create a composite measure of patient-centeredness. Additional survey questions assessed patients’ sociodemographic characteristics. The survey was conducted from mid-2010 to early 2011.

Identification of Patients’ Primary Care Clinician

A clinician was identified for a patient only if the patient (1) saw that clinician for a majority of primary care visits in 3 years, (2) visited that clinician at least 3 times in that period, and (3) confirmed on the questionnaire that he/she received regular care from that clinician. The patient was also asked how many years he/she had been going to that clinician.

Ethnicity/Race

Patients were first screened by the ethnicity/race recorded in their medical files to include only black, Latino, or white patients. Those who were subsequently contacted were asked to identify their ethnicity/race (with results showing 90% agreement with records), and their self-identified ethnicity/race was used for analysis.

Statistical Analyses

We evaluated differences in patients’ demographics using the Pearson χ2 test for categorical variables, the nonparametric Kruskal-Wallis test for ordered categorical variables, and analysis of variance for continuous variables. The primary dependent variables were the patients’ responses to the 4 PCAS subscales and the composite measure of patient-centeredness, with the patients’ ethnicity/race and each measure of their clinicians’ ethnic/racial bias used as predictors. The specific effect of interest was the degree to which black or Latino patients differed from white patients in their ratings of the clinicians, and critically, the extent to which those differences were themselves predicted by the clinicians’ ethnic/racial bias (analyzed as continuous variables). Measures of clinician bias against blacks were used in predicting black patients’ ratings; measures of clinician bias against Latinos were used in predicting Latino patients’ ratings. Because patients were nested under clinicians, who were themselves nested under clinics, the data were analyzed using hierarchical linear modeling or mixed effects models. White patients were always used as the reference group. We also considered a nonlinear relationship between patient’s survey ratings and clinician bias using a simple linear spline with 5 knots.

Supplementary analyses were conducted to examine additional patient background characteristics (sex, age, socioeconomic status, and, for Latinos only, Spanish and English language proficiency) as statistical controls and to assess subgroup differences. Age was analyzed in decades, and socioeconomic status was analyzed as a dichotomous variable in terms of education (high school or less vs at least some college). Reported income was not used for socioeconomic status because of missing data. Spanish and English language proficiency was analyzed as a dichotomous variable: patients were coded as having greater Spanish than English proficiency if they chose to complete the survey in Spanish or they reported that they were fluent in Spanish but less than fluent in English; all other patients were assigned to the alternate category.

RESULTS

From the original group of 210 clinicians who had completed the measures of ethnic/racial bias,26 134 (64%) met this study’s inclusion criteria. These clinicians’ characteristics—54% female, 75% white, and 50% with more than 10 years of clinical experience— were nearly identical to those previously reported for the full clinician sample.26 As in the full sample, approximately two-thirds of the clinicians had implicit bias against blacks (43% moderate to strong) and Latinos (51% moderate to strong), while reporting very little explicit bias against either group.

Of the 6,129 patients in the recruitment pool, 2,908 (47%) completed the survey questionnaire. Reasons for nonparticipation varied: 1,878 were unreachable, 558 were unable (eg, because they had died or had long-term disability), 780 declined, and 5 did not answer enough questions. Characteristics of the participating and nonparticipating patients are shown in Table 1.

View this table:
Table 1

Characteristics of Participating and Nonparticipating Patients

Among participating patients, all 3 ethnic/racial groups had well-established relationships with their clinicians: two-thirds of each group saw their named clinician for at least 70% of their primary care visits, the average clinical relationship had been ongoing for more than 3 years, and there had been an average of more than 7 visits with the clinician in 3 years.

Primary Outcomes

Patients’ Ratings of Clinicians’ Patient-Centeredness

Patients in all 3 groups evaluated their clinicians favorably on the measures of patient-centered care (Table 2), similar to what has been found in previous large-scale studies.3,7,38–42 Compared with white patients, black patients gave mostly equivalent ratings to the clinicians (composite scale difference, P = .84), whereas Latino patients gave comparatively lower ratings (composite scale difference, P <.0001).

View this table:
Table 2

PCAS Scores by Patients’ Ethnicity/Race

Patients’ Ratings as a Function of Clinicians’ Implicit Bias

There were consistent associations between clinicians’ implicit bias and their black patients’ evaluations of them: the stronger the clinicians’ implicit preference for whites over blacks, the lower their black patients rated them. This negative association was seen to varying degrees on all 4 subscales (Figure 1) and on the composite scale (t = 2.05, P = .04); Table 3 shows model estimates and Figure 2 shows predicted composite scale values for individual clinicians. As a concrete example, black patients rated clinicians who scored 1.0 on the IAT (strong bias) approximately 6 points lower on interpersonal treatment than clinicians who scored 0 on the IAT (no bias).

Figure 1
Figure 1

Predicted ratings of clinicians as a function of their implicit bias (IAT) score and their patients’ ethnicity/race. White patients always served as the reference group (data not shown).

IAT = Implicit Association Test.

Figure 2
Figure 2

Predicted composite scale ratings by black, Latino, and white (reference) patients for individual clinicians with specific IAT scores.

IAT = Implicit Association Test.

Note: The lines show the overall (unconditional) estimate of the relation between clinician implicit bias scores and predicted patient ratings. The symbols show the individual (conditional) estimates for each clinician with a specific IAT score by each ethnic/racial patient group.

View this table:
Table 3

Effects of Ethnic/Racial Group and Interactions Between Group and Clinicians’ Implicit Bias on Patients’ PCAS Ratings of the Clinicians

In contrast, there was no association between Latino patients’ ratings and their clinicians’ implicit ethnic/racial bias on any of the 4 subscales or the composite scale (t = 0.03, P = .98). Tests of nonlinearity with knots at IAT scores of –0.65, –0.35, 0, 0.35, and 0.65, showed that all associations (or lack thereof) were similar in magnitude across the range of bias scores (data not shown).

Patients’ Ratings as a Function of Clinicians’ Explicit Bias

Neither the thermometer nor the trait rating measures of clinicians’ explicit ethnic/racial bias was associated with patients’ ratings of patient-centered care, for black patients (composite scale P = .13 and .23) or for Latino patients (composite scale P = .23 and .16).

Subgroup Analyses

For black patients, only age moderated the association between patients’ ratings and clinicians’ implicit bias, so that the negative association was significantly stronger for younger than older patients; the race-by-age interaction was significant or nearly so for interpersonal treatment (P = .06), communication (P = .01), trust (P = .01), and contextual knowledge (P = .07), as well as for the composite score (P = .02) (Figure 3). As an example, the model showed that among blacks aged 40 years, clinicians with an IAT score of 1.0 were rated 12 points lower on communication than clinicians with a score of 0; among blacks aged 60 years, that difference was only 2 points. None of the background characteristics, including language, altered the primary findings for Latino patients (data not shown).

Figure 3
Figure 3

Predicted ratings of clinicians by younger and older black patients, as a function of clinicians’ implicit bias score on the Black:White IAT.

IAT = Implicit Association Test.

DISCUSSION

Our data show that clinicians’ implicit ethnic/racial bias is related to the quality of clinical relationships for some patients: clinicians with greater implicit bias against blacks were consistently evaluated as providing less patient-centered care by their black patients than were clinicians with little or no such implicit bias. We did not assess health outcomes in this study, but prior research has shown that patients who evaluate their clinicians more positively on these same measures of patient-centeredness are more satisfied with their care,3 are more likely to adhere to treatment and follow-up with their clinician,3–5,7 and have better health outcomes.3,9

Although Latino patients generally gave their clinicians lower ratings than did other patient groups, these ratings were unrelated to the clinicians’ ethnic/ racial bias. Even subgroups shown previously to have greater concerns with clinical interactions (eg, Spanish-speaking Latinos43–45) did not provide lower evaluations to more-biased clinicians. This is the first study to investigate the perceptions of Latino patients in relation to clinician bias, and the difference in findings for this group requires further investigation.

Only 2 prior studies46,47 have examined the link between clinicians’ implicit bias and patients’ perceptions, both with small samples of clinicians and patients. One study46 found that black patients gave lower ratings to clinicians having greater implicit race bias, but only if the clinicians also reported very low levels of explicit bias. The other study47 found more consistent associations between black patients’ ratings and clinicians’ implicit bias; however, even at higher levels of implicit race bias, black patients in that study tended to rate the clinicians more positively than did the white patients, complicating the study conclusions.

The current findings extend previous work on patient perceptions in important ways. This study was conducted with a robust sample of experienced clinicians from 2 different organizations, a large sample of patients in ongoing clinical relationships with those clinicians, validated measures of patient-centeredness (associated in prior research with patient satisfaction, adherence, and health outcomes), and a nested study design that included a large sample of white patients to more closely pinpoint ethnic/racial differences among patients who see the same clinician.

Three additional studies48–51 have examined the potential for clinicians’ implicit bias to alter their clinical decision making in hypothetical scenarios. One study48 found that implicit bias was related to clinical decisions, the second49,51 produced mixed results, and the third50 did not find any association between implicit bias and clinical decisions. The small size of these studies and their reliance on hypothetical scenarios prevent a firm conclusion, but the inconsistency of results suggests that the effect of implicit bias on clinical decision making is not robust.

Our study was motivated by the hypothesis that clinicians with implicit bias may communicate differently in clinical encounters with minority patients, reducing the patients’ comfort and trust in those clinicians. Our results suggest that such may be the case for black patients, but perhaps not for Latino patients. Additional investigation will be needed to determine why implicit bias is reflected in the evaluations of some groups but not others. Possible explanations include the manner in which clinicians express bias, the patients’ sensitivity to it, or varying expectations and concerns.

The lack of association found in this study between clinicians’ explicit bias and patients’ perceptions may seem surprising—an intentionally biased clinician ought to be viewed very poorly by minority patients. As we and others have reported, however, clinicians demonstrate very little explicit bias against blacks or Latinos.26,48–52 As there is only a small probability that minority patients would encounter an explicitly biased clinician, there is little possibility of finding an association involving that form of bias.

The findings of this study are limited by several factors. As it was an observational study, a clear assignment of causality cannot be made. The lower-than-desired patient participation rate also allows for the possibility that response bias may have affected the results. The type of response bias that would explain the complex relationships obtained in this study is, admittedly, difficult to imagine. The study was restricted in scope to established primary care clinicians and their longer-term patients, specifically those with diagnosed hypertension. In our view, this restriction provides a more conservative test of the hypothesis because patients are less likely to remain with clinicians with whom they are dissatisfied.

In conclusion, patient-centeredness is a key competency in the training and professional development of health care clinicians,1,53 and its importance has been further underscored by the establishment of a national Patient-Centered Outcomes Research Institute.54 Our research shows that clinicians’ implicit bias may be involved in the delivery of patient-centered care for blacks. This finding supports the contention of the Institute of Medicine18 that clinician bias may contribute to health disparities, if indirectly. What might clinicians do to avoid implicit bias in their patient interactions? Laboratory research shows that even though it is implicit, this form of bias is still malleable and changes in response to specific alterations in situational demands and social norms.55 Helping patients to respond to bias in a manner that helps to deflect a negative outcome is another path for intervention.55 For progress to be made, bias must be rendered less implicit and unconscious, to foster real reflection, analysis, and change.

To read or post commentaries in response to this article, see it online at http://www.annfammed.org/content/11/1/43.

Funding support: This study was supported by grant HL088198 from the National Heart, Lung, and Blood Institute of the National Institutes of Health.

Acknowledgments: We thank the following individuals, who were compensated for their work: Natalie Wheeler, BA (Department of Psychology and Neuroscience, University of Colorado Boulder) for assistance with the patient questionnaires; Allison Ackermann (Abt SRBI Inc) for directing and managing the collection of the patient questionnaires; Anju Gupta (Institute for Health Research, Kaiser Permanente Colorado) and Brian Eckert (Denver Health) for assistance with analyzing the electronic health record databases; and Stacie Daugherty, MD, MPH (School of Medicine, University of Colorado Denver) for her suggestions during the study and her helpful comments on this article.

Footnotes

  • Conflicts of interest: authors report none.

  • Received for publication March 25, 2012.
  • Revision received June 20, 2012.
  • Accepted for publication July 11, 2012.

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