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The American Journal of Managed Care August 2012
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Racial Disparities in African Americans With Diabetes: Process and Outcome Mismatch
John B. Bulger, DO; Jay H. Shubrook, DO; and Richard Snow, DO, MPH
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Racial Disparities in African Americans With Diabetes: Process and Outcome Mismatch

John B. Bulger, DO; Jay H. Shubrook, DO; and Richard Snow, DO, MPH
Racial disparities are widespread in healthcare. Disparities can have a strong influence on diabetes care. This manuscript explores the source of such disparities.
Background: Over the past 2 decades, numerous studies have demonstrated the existence of racial disparities in patient care in the United States. Specifically, African Americans with diabetes are less likely to have recommended process of care measures performed and outcome benchmarks for quality of care.


Objectives: To evaluate the delivery of diabetes care (processes and outcomes) associated with racial categories using a national web-based registry—the American Osteopathic Association Clinical Assessment Program (AOA-CAP).


Study Design: A retrospective analysis of data retrieved from the AOA-CAP database on outcomes and process measures for diabetes.


Methods: A total of 10,699 Caucasian and African American patients who received diabetes care had data entered into the AOA-CAP registry between July 1, 2005, and October 30, 2010. African Americans represented 3123 patients (29%), Caucasians 7576 (71%). Demographic, process of care, and outcomes comparisons between ethnicities were carried out using χ2 and t tests. Composite measures of process and outcomes of diabetes care were created to investigate the effect of race on care.


Results: The process of care composite measure was significantly different among African American patients (P = .02) who were more likely to receive all indicated care than Caucasian patients (33.9% vs 31.6%). Evaluation of the composite outcome measure, which quantifies the percentage of patients achieving control of all 3 intermediate outcomes, was (P <.001) lower in African Americans than in Caucasians (8.1% vs 12.3%).


Conclusions: African American patients with diabetes were as likely or more likely to have recommended process of care measures performed. In spite of this, intermediate diabetes outcomes were still poorer in the same African American population.


(Am J Manag Care. 2012;18(8):407-413)
  •  Racial disparities are widespread in healthcare.

  •  Racial disparities can affect diabetes outcomes and, therefore, performance measurement.

  • The source of such disparities is often unknown.

  • This manuscript shows how patient outcomes and processes of care can be affected differently by racial disparities.
Over the past 2 decades, numerous studies have clearly demonstrated that both racial and ethnic disparities exist in healthcare delivery and outcomes in the United States.1-3 In 2002, the Institute of Medicine defined disparities as “racial or ethnic differences in the quality of healthcare that are not caused by accessrelated factors or clinical needs, preferences, and appropriateness of intervention.”1 The report also highlighted the uncertainty in understanding the root causes of this disparity. As part of “Healthy People 2010,” the Department of Health and Human Services called for an elimination of disparities in healthcare.2 In order to meet this demand we must better understand the basis of the problem.

Previous data show that African Americans with diabetes are less likely to have recommended process of care measures such as glycated hemoglobin (A1C) and lipid measurements performed.3,4 There is also evidence to suggest that African Americans with diabetes in particular have disparate results on outcome measures such as blood glucose control, blood pressure control, A1C values, cholesterol values, and incidences of retinopathy, chronic kidney disease, and lower-extremity amputations.5-7 While it is clear that disparities in both process and outcomes exist, there continues to be a lack of understanding as to how these disparities are related and if they are consistently related to these opportunity gaps described above.8 This connection is critical to help guide parity in healthcare outcomes for all patients.

Physicians’ understanding of the significance and magnitude of the effects of racial disparities on healthcare appear to be lower than one might expect given the previously cited publications. In a study of cardiologists, for example, only one-third felt that racial health disparities existed.9 In the same study, only 1 in 8 felt that disparities existed within their own practice. In a review of cardiothoracic surgeons, while some surgeons acknowledged that disparities existed, most attributed these disparities to patient characteristics.10 These examples are not unique to 1 specialty or even to the care of chronic diseases in general. Rather, they are endemic to the US healthcare system.

Change in healthcare requires a multidisciplinary effort that includes significant physician, patient, and system changes. Physician-led, multidisciplinary teams need accurate, timely data to drive change.11 The evidence is variable that quality improvement practices can lessen disparities in diabetes care.12 One method is a systematic data collection and review with patient registries. Patient registries can provide a useful tool to aid in data collection and analysis.13 In order to understand the effect of disparities on processes and outcomes of care and maximize the benefit of these registries, it is imperative that race be included as a variable.14 We are using registries to understand quality opportunities and to judge performance at the healthcare provider level. Risk adjustment is important to isolate the effect of interventions or the contribution by the provider.

Using diabetes as a sample population, the authors explored a national database from osteopathic residency programs— the American Osteopathic Association Clinical Assessment Program (AOA-CAP). The authors evaluated the delivery of diabetes care to determine if there were differences in the process and outcomes of care associated with 2 racial categories.

METHODS

This study entailed retrospective analysis of national registry data collected from osteopathic family medicine and internal medicine residency programs. The AOA-CAP is a web-based registry providing a standard method of sampling patients and collecting information from medical records on key processes and outcomes of diabetes care. The diabetes module has been operational since 2003. Data are collected for the purposes of quality improvement and satisfaction of core competencies of systems-based practice and practice-based learning within osteopathic graduate medical education. The process and outcomes measures for the diabetes care database were developed from guidelines for diabetes care promulgated by the American Diabetes Association and the American Association of Clinical Endocrinologists.15,16 Measure development is overseen by the AOA-CAP Steering Committee with representation from internal medicine and family medicine program directors and leadership from the AOA. Clinical indicator definitions and constructs are “harmonized” with national organizations, including the National Committee on Quality Assurance, the American Medical Association Physician Consortium for Performance Improvement, and the National Quality Forum17-19 Table 1 lists the numerator and denominator of each of the process of care measures and the intermediate outcome measures used in this analysis. Materials for AOA-CAP include documents standardizing patient selection, sampling, and data collection.

Residents imported the data on their own patients as part of a separate educational activity. There were no resident incentives or penalties based on how they performed on the data set for their patients. Information was abstracted from patient medical records using the most recent visit as a starting point and review of care prior to the most recent visit during a specified time period for each measure. Case selection for diabetes mellitus was based on any International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis of diabetes. Patients included in the database had to be older than 18 years and have had diabetes for at least 1 year, as well as have had at least 2 visits to the clinic. Patients treated by diet and lifestyle alone were excluded, as they were often monitored less closely. A sample size of 40 patients per residency program was recommended in order to provide a meaningful sample. However, cases from all programs were used regardless of the number of cases contributed by the program. Analysis excluded data from non-Caucasian and non– African American patients. Information regarding patient demographics and treatment were collected from each medical record. Data elements were entered in a Health Insurance Portability and Accountability Act–compliant manner into a web-based data collection form along with program identification.

The population included for this study included all diabetic cases entered into the AOA-CAP registry between July 1, 2005, and October 30, 2010, with race designations of Caucasian or African American (as other race designations are minimally represented in the database). Composite process and outcome measures were based on the percentage of patients receiving all indicated care or achieving goals on all intermediate outcomes. The composites were developed to evaluate the summary performance across the 2 categories of race. Demographic, process of care, and outcome comparisons between races were carried out using χ2 and t tests, as appropriate. To investigate the potential bias introduced by differing demographic factors between the 2 races, multivariable analysis was used to evaluate the association between process and outcome composite and race. A hierarchical model using the type of residency program (family practice or internal medicine) as a class variable evaluated the effect of provider type on the findings. All analysis was completed using SAS Version 9.1 software (SAS Institute, Cary, North Carolina). This study was approved by the Geisinger Health System Institutional Review Board.

RESULTS

A total of 10,699 patients with diabetes fit the criteria for this study. Data were abstracted across 195 osteopathic family medicine and internal medicine programs. African Americans represented 3123 patients (29%) and Caucasians 7576 (71%). The demographics of the patients are displayed in Table 2. There were significant baseline differences between the 2 ethnicities with regard to age: African American patients were on average 1.3 years younger (P <.001). The percentage of men was greater in the Caucasian population (45.2% vs 41.9%). In addition, African American patients were significantly more likely to be on insulin (P = .003). African American patients were significantly more likely to have Medicaid as the primary insurance (25.3% vs 19.4%; P <.001) and significantly less likely to have commercial insurance (21.8% vs 25.2% P <.001) or Medicare (32.1% vs 26.1%; P = .05) compared with Caucasians.

Achievement of specific process or outcomes goals across ethnicity is displayed in Table 3. Higher rates of foot exam (P = .02), recommendation of ophthalmologic exam (P <.001), and screening for microalbuminuria (P >.001) were seen among the African American patients. The process composite measure, representing the percentage of patients with all indicated processes of care, was also significantly higher among African American patients (P = .02). However, intermediate diabetes outcomes were significantly lower in African Americans, including meeting the glucose (P <.001), blood pressure (P <.001), and LDL-C goals (P <.001). The composite outcome measure was also (P <.001) lower among African American patients.

A multivariable model was used to evaluate the effect of demographic differences on the process and outcome composite scores. The results, displayed in Table 4, suggest that after adjusting for the demographic differences, African Americans were still significantly more likely to have indicated processes of care. Other factors that predicted meeting the process of care composite measure included male gender and patients requiring insulin. Self-pay status predicted an odds ratio (OR) of 0.56 for meeting the process of care measure. African American patients were significantly less likely to achieve treatment goals as measured by the intermediate outcomes (OR 0.67). Other factors predicting failure to meet the outcome composite measure included patients who required insulin (OR 0.44). The magnitude of difference between process composite scores demonstrated an OR of 1.25 (CI 1.06-1.47) higher than the percentage found on bivariate analysis. The difference between outcome composite scores was an OR of 0.67 (CI 0.51-0.89), similar to the magnitude found in bivariate analysis. Results of hierarchical modeling using provider type did not affect the associations found in logistic regression between race andother covariates.

DISCUSSION

Using a large national patient registry of patients from osteopathic family medicine and internal medicine residencies, we found that African American patients with diabetes were more likely to have recommended process of care measures performed. This was driven primarily by higher levels of foot exams, recommendations of ophthalmologic exam, and screenings for microalbuminuria among African American patients. In spite of this, intermediate diabetes outcomes were still poorer in the same African American population. The disparity in outcomes was consistent across all 3 outcome components, with African American patients achieving lower levels of control of glucose, blood pressure, and lipids. Hence, these patients may be seeing action without benefit.

 
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