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Original Article |

Race and Insurance Status as Risk Factors for Trauma Mortality FREE

Adil H. Haider, MD, MPH; David C. Chang, MPH, MBA, PhD; David T. Efron, MD; Elliott R. Haut, MD; Marie Crandall, MD, MPH; Edward E. Cornwell III, MD
[+] Author Affiliations

Author Affiliations: Departments of Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland (Drs Haider, Chang, Efron, and Haut); Feinberg School of Medicine, Northwestern University, Chicago, Illinois (Dr Crandall) Howard University College of Medicine, Washington, DC (Dr Cornwell).


Arch Surg. 2008;143(10):945-949. doi:10.1001/archsurg.143.10.945.
Text Size: A A A
Published online

Objective  To determine the effect of race and insurance status on trauma mortality.

Methods  Review of patients (aged 18-64 years; Injury Severity Score ≥ 9) included in the National Trauma Data Bank (2001-2005). African American and Hispanic patients were each compared with white patients and insured patients were compared with uninsured patients. Multiple logistic regression analyses determined differences in survival rates after adjusting for demographics, injury severity (Injury Severity Score and revised Trauma Score), severity of head and/or extremity injury, and injury mechanism.

Results  A total of 429 751 patients met inclusion criteria. African American (n = 72 249) and Hispanic (n = 41 770) patients were less likely to be insured and more likely to sustain penetrating trauma than white patients (n = 262 878). African American and Hispanic patients had higher unadjusted mortality rates (white, 5.7%; African American, 8.2%; Hispanic, 9.1%; P = .05 for African American and Hispanic patients) and an increased adjusted odds ratio (OR) of death compared with white patients (African American OR, 1.17; 95% confidence interval [CI], 1.10-1.23; Hispanic OR, 1.47; 95% CI, 1.39-1.57). Insured patients (47%) had lower crude mortality rates than uninsured patients (4.4% vs 8.6%; P = .05). Insured African American and Hispanic patients had increased mortality rates compared with insured white patients. This effect worsened for uninsured patients across groups (insured African American OR, 1.2; 95% CI, 1.08-1.33; insured Hispanic OR, 1.51; 95% CI, 1.36-1.64; uninsured white OR, 1.55; 95% CI, 1.46-1.64; uninsured African American OR, 1.78; 95% CI, 1.65-1.90; uninsured Hispanic OR, 2.30; 95% CI, 2.13-2.49). The reference group was insured white patients.

Conclusion  Race and insurance status each independently predicts outcome disparities after trauma. African American, Hispanic, and uninsured patients have worse outcomes, but insurance status appears to have the stronger association with mortality after trauma.

Figures in this Article

In 2003, the Agency for Healthcare Research and Quality1 reported that, “Some ethnic minorities and low-income families of all races tend to be in poorer health.” Subsequently, a body of literature has accumulated describing race-based outcome disparities in surgical populations.2 In trauma care, racial disparities in posttraumatic functional outcomes have been described in both adult3 and pediatric trauma populations.4

Disparities based on health insurance status have also been demonstrated in the detection, treatment, and outcomes of several disease conditions, including cancer.58 Adult trauma studies have described differences in outcomes and discharge dispositions based on insurance coverage.3,9 In a study by Marquez de la Plata and colleagues,3 it was suggested that insurance status, rather than race, determined disparities in rehabilitation placement. Another study of elderly patients hospitalized secondary to a traumatic fall also found that payment type was a factor in deciding a patient's discharge location.10

Current literature fails to adequately explain the interactions between race, insurance status, and outcomes following trauma. It is not clear whether the previously described racial disparities can be explained solely by insurance or socioeconomic status. We therefore endeavored to use a national database to determine the independent effects of race and insurance status on trauma mortality.

STUDY DESIGN AND PATIENT POPULATION

This study involved a retrospective analysis of trauma patients entered in the National Trauma Data Bank, version 6.1, between 2001 and 2005. The National Trauma Data Bank is maintained by the American College of Surgeons and is the largest repository of data on trauma inpatients in the United States, collecting data from approximately 700 trauma centers and hospitals that treat trauma patients.

Patients aged 18 to 64 years with moderate to severe injuries (Injury Severity Score [ISS] ≥ 9) caused by blunt or penetrating trauma were included in the study. Trauma patients with an ISS of 9 or higher were selected because these patients suffered at least moderate injury and would be at risk of dying of trauma. Mortality following trauma was our primary outcome measure. Pediatric trauma patients (aged ≤ 17 years) and elderly trauma patients (aged ≥ 65 years) were excluded from our analysis because trauma effects patients in these age groups differently11 and because children or elderly patients could have government-sponsored insurance (State Children's Health Insurance Program and Medicare) that could confound our analysis. Burn patients were also excluded from this study. This study was reviewed by the Johns Hopkins University School of Medicine institutional review board and approved for exempt status.

Patients were grouped by self-reported race (African American, white, or Hispanic) and by insurance status of insured (commercial, health maintenance organization, workers compensation, managed care organization, Civilian Health and Medical Program of the Uniformed Services, automobile insurance, organ donor subsidy) or uninsured (Medicaid, self-paying, no insurance). To study the interaction between insurance and race, patients were further stratified into 6 categories: insured white, insured African American, insured Hispanic, uninsured African American, uninsured Hispanic, and uninsured white. Each of these groups was compared with insured white patients, which was chosen as the reference group during the stratified and multivariate analyses. Other races and ethnic groups (eg, Asian Americans, American Indians, Pacific Islanders) were excluded from the study owing to small sample sizes.

STATISTICAL ANALYSIS

Multiple logistic regression was used to analyze survival differences based on race and insurance status. Patient data were adjusted for age, sex, and several other factors known to affect outcomes after trauma.12 Severity of anatomical and physiological injury was adjusted for using the ISS13 and revised Trauma Score (RTS),14 respectively. The ISS was treated as an ordinal variable with 3 groups (ISS of 9-15 indicates moderate injury; 16-24, severe injury; 25 and above, most severe injury). Patients were also adjusted for the presence of severe head injury and/or severe extremity injury using the Abbreviated Injury Scale (AIS)15; an AIS score of 3 or higher in the head or extremity was deemed severe. Finally, patient data were adjusted for type of injury (blunt vs penetrating) and mechanism of injury. Mechanism of injury categories were created according to the Centers for Disease Control and Prevention's recommended framework for classifying injury data using International Classification of Diseases, Ninth Revision E codes.16

A t test was used to compare continuous variables, and a χ2 test was done for comparison of categorical variables during univariate analysis. Odds ratios for mortality were calculated after adjusting for patient demographics and injury severity, as described in the previous paragraphs. Stata Version 10 (Stata, College Station, Texas) was used for all statistical calculations. Statistical significance was defined as a P value less than .05.

Of 1 466 887 patients in the National Trauma Data Bank during the years studied, 429 751 had moderate to severe injuries and were between the ages of 18 and 65 years, meeting our inclusion criteria. Of these, 12.2% were either in the “other” race category (eg, Asian, Pacific Islander, American Indian) that had small sample sizes or did not have race data reported. This yielded a sample of 376 897 (Figure 1) patients for analysis. Overall, the mean age was 37 years and more than two-thirds were male; 69% were white, 19% African American, and 11% Hispanic (Table 1). More than half of the total patients had insurance. The African American and Hispanic groups had more uninsured patients than the white group (Table 1).

Place holder to copy figure label and caption
Figure 1.

Flowchart of patient selection criteria. NTDB indicates National Trauma Data Bank; ISS, Injury Severity Score; “Other” * indicates patients who indicated racial or ethnic group other than African American, Hispanic, or white on survey.

Graphic Jump Location

Crude mortality rates were 5.7%, 8.2%, and 9.1% for the white, African American, and Hispanic groups, respectively. A statistically significant difference was found between the white group and the African American and Hispanic groups (P < .005). Crude mortality by insurance status was statistically lower for insured (4.4%) than for uninsured (8.6%) patients (P < .005).

In conducting the stratified and multivariate analyses, only patients with complete data for all variables were included in the regression models. Eighty-three percent of patients from the initial analysis had complete data, resulting in a final sample size of 311 503 (13% had missing insurance data and the rest had missing data regarding ISS, RTS, AIS score, age, or sex).

Table 2 provides injury severity characteristics stratified by race and insurance status. Penetrating trauma was highest in African American patients regardless of insurance status. Mortality rates were substantially higher for all uninsured patients, almost doubling for African American (4.9% to 11.4%) and Hispanic patients (6.3% to 11.3%) compared with white patients (4.2% to 7.9%). Anatomical injury severity scores were clinically similar across all race/insurance groups, while physiological injury scores were slightly worse among the uninsured.

Table Graphic Jump LocationTable 2. Injury Severity Characteristics Stratified by Race and Insurance Status

After adjusting for demographic and injury severity variables, the odds of mortality had increased to 1.17 for African American patients (95% confidence interval [CI], 1.10-1.23) and 1.47 for Hispanic patients (95% CI, 1.39-1.57) when compared with white patients. Odds of death had increased to 1.46 for uninsured patients (range, 1.39-1.54) compared with insured patients. Figure 2 shows the independent influence of insurance status on the odds of death compared with white patients with insurance (reference group).

Place holder to copy figure label and caption
Figure 2.

Adjusted odds of mortality by race and insurance status (n = 311 503). Values in parentheses are 95% confidence intervals. * Indicates reference group.

Graphic Jump Location

Even with insurance, African American and Hispanic patients had a greater adjusted mortality rate than their white counterparts. However, the highest adjusted odds of death were for uninsured Hispanic patients (2.30; 95% CI, 2.13-2.49) followed by uninsured African American patients (1.78; 95% CI, 1.65-1.90) when compared with insured white patients, suggesting that insurance status has a stronger association with mortality after trauma.

Racial disparities have been previously described for outcomes and access to rehabilitation therapies following traumatic brain injury.3,4,9 To our knowledge, this is the first large study that identifies differences in mortality rates based on race following trauma of all types. In this study both race and insurance status independently predicted mortality following trauma. The absence of health insurance increased a trauma patient's adjusted odds of death by almost 50%. Of the insured patients, both Hispanic and African American patients had significantly higher odds of mortality compared with white patients. This confirms that racial disparities in trauma mortality cannot be completely explained by insurance status alone.

Analyzing the unadjusted data, we found that the anatomical injury severity scores were similarly high across all race/insurance groups, suggesting that all patients were significantly injured. Uninsured patients had worse physiological injury severity scores, which is likely a result of the much higher prevalence of penetrating trauma in this group. Uninsured African American patients had a 10-fold higher prevalence of penetrating trauma when compared with insured white patients. Conversely, insured patients more frequently had severe head and extremity trauma. These findings underline the importance of controlling for both the anatomical and physiological severity of injury along with the type and mechanism of injury. The inclusion of these parameters in our multivariate analytic model adequately controls for the effect on outcome of these observed differences.

In the trauma patients sampled, there was a much higher percentage of uninsured minorities than uninsured white patients. While about one-third of white patients were uninsured, approximately two-thirds of African American patients and two-thirds of Hispanic patients were uninsured. This insurance disparity is consistent with other studies of trauma care.3,9 Lack of medical insurance is most often associated with worse baseline health status, with increased and poorly recognized comorbidities. It is known that preexisting medical conditions are associated with poor outcomes after trauma,17 suggesting that an uninsured patient would do worse after traumatic injury. This may partially explain our finding that the adjusted odds of death substantially increased for all uninsured patients, even when we controlled for injury severity and other factors known to affect trauma outcomes.

Insurance coverage has had a similar effect on treatment use and mortality for certain cancer patients. Patients who were uninsured or covered by Medicaid had higher mortality rates from breast carcinoma8 and received guideline therapy less often18 than insured patients. This work suggests that quality of care issues for trauma patients are worthy of investigation. In a statewide study of trauma patients in Massachusetts,19 uninsured patients were less likely to receive an operation, less likely to receive rehabilitative therapies (in-house physical therapy), and more likely to die in the hospital. Similarly, in a medical study, minority patients received worse quality of care that, in turn, led to worse outcomes.20 In a more recent quality-of-care study in the emergency department,21 researchers only found significant differences in the number of radiological studies ordered for trauma patients. However, this was a single-institution study, and the conclusions called for further study to determine whether race or insurance status led to these differences in quality of care.

Race persists as a risk factor for mortality in patients with and without insurance. Hispanic patients had worse outcomes in both the insured and uninsured groups. Shafi et al9 suggest that cultural barriers and language problems may contribute to similar observed racial disparities in traumatic brain injury outcomes. Our study likely provokes more questions than it provides answers for. It may be that insurance status is a surrogate for other factors that affect mortality in a critically injured patient (eg, health education, awareness and management of comorbidities, substance abuse, and risk-taking behaviors). In brief, insurance represents more than just the ability to pay a bill.

Further study is required to explore other potential issues that may contribute to these disparities, including mistrust, subconscious bias, and stereotyping that may be present in the health care system.22 However, multivariate analysis showed that insurance status had a stronger association than race, with worse outcomes. These data suggest that addressing disparities in health insurance status would have a significant effect on outcomes of traumatic injuries for African American, Hispanic, and white patients.

There are limitations to our study. Because we used a retrospective registry, it was not possible to control for comorbidities, complications that may have occurred during hospitalization, and prehospital transit times that could influence our outcomes. Data to analyze prehospital mortality were also not available, and it could not be determined if prehospital mortality is higher for uninsured or African American and Hispanic patients. Finally, Medicaid patients were grouped with the uninsured. However, this was a very small group (<5%) and should not influence our results.

Both race and insurance status independently influenced mortality after moderate to severe trauma in adults aged 18 to 64 years. This study refutes the notion that racial disparities are merely a reflection of insurance status differences. Understanding insurance and race-dependent differences is a crucial first step toward ameliorating health care disparities. The next step will be to comprehend the underlying reasons for these differences, which will enable the development of interventions to close the gap between patients of different races and payer statuses.

Correspondence: Adil H. Haider, MD, MPH, Department of Surgery, Division of Trauma, Johns Hopkins Hospital, 600 N Wolfe St, Blalock 688, Baltimore, MD 21287 (ahaider1@jhmi.edu).

Accepted for Publication: May 8, 2008.

Author Contributions:Study concept and design: Haider, Chang, Efron, Haut, and Cornwell. Acquisition of data: Haider and Chang. Analysis and interpretation of data: Haider, Chang, Efron, Haut, Crandall, and Cornwell. Drafting of the manuscript: Haider, Efron, and Cornwell. Critical revision of the manuscript for important intellectual content: Haider, Chang, Efron, Haut, Crandall, and Cornwell. Statistical analysis: Haider, Chang, and Crandall. Obtained funding: Haider. Administrative, technical, and material support: Haider. Study supervision: Efron and Cornwell.

Financial Disclosure: None reported.

Funding/Support: This study was supported by the Johns Hopkins School of Medicine Department of Surgery New Faculty Academic Support Grant (Dr Haider).

Previous Presentation: This study was presented as an oral presentation at the 79th Annual Meeting of the Pacific Coast Surgical Association; February 17, 2008; San Diego, California.

Additional Contributions: The authors would like to thank Melanie Neal, Chrystal Price, Sandra Globe, and the many professionals of the American College of Surgeons who have made the National Trauma Data Bank a reality. We would also like to thank Christine G. Holzmueller, BLA, for her assistance in the preparation of this manuscript.

 Agency for Healthcare Research and Quality. National Healthcare Disparities Report. Rockville, MD Agency for Healthcare Research and Quality2003;
Lucas  FLStukel  TAMorris  AM  et al.  Race and surgical mortality in the United States. Ann Surg 2006;243 (2) 281- 286
PubMed Link to Article
Marquez de la Plata  CHewlitt  Mde Oliveira  A  et al.  Ethnic differences in rehabilitation placement and outcome after TBI. J Head Trauma Rehabil 2007;22 (2) 113- 121
PubMed Link to Article
Haider  AHEfron  DTHaut  ER  et al.  Black children experience worse clinical and functional outcomes after traumatic brain injury: an analysis of the National Pediatric Trauma Registry. J Trauma 2007;62 (5) 1259- 1263
PubMed Link to Article
Chen  AYSchrag  NMHalpern  MT  et al.  The impact of health insurance status on stage at diagnosis of oropharyngeal cancer. Cancer 2007;110 (2) 395- 402
PubMed Link to Article
Richardson  LCTian  LVoti  L  et al.  The roles of teaching hospitals, insurance status, and race/ethnicity in receipt of adjuvant therapy for regional-stage breast cancer in Florida. Am J Public Health 2006;96 (1) 160- 166
PubMed Link to Article
Kelz  RRGimotty  PAPolsky  D  et al.  Morbidity and mortality of colorectal carcinoma surgery differs by insurance status. Cancer 2004;101 (10) 2187- 2194
PubMed Link to Article
Roetzheim  RGPal  NTennant  C  et al.  Effects of health insurance and race on early detection of cancer. J Natl Cancer Inst 1999;91 (16) 1409- 1415
PubMed Link to Article
Shafi  Sde la Plata  CMDiaz-Arrastia  R  et al.  Ethnic disparities exist in trauma care. J Trauma 2007;63 (5) 1138- 1142
PubMed Link to Article
Lim  HJHoffmann  RBrasel  K Factors influencing discharge location after hospitalization resulting from a traumatic fall among older persons. J Trauma 2007;63 (4) 902- 907
PubMed Link to Article
Susman  MDiRusso  SMSullivan  T  et al.  Traumatic brain injury in the elderly: increased mortality and worse functional outcome at discharge despite lower injury severity. J Trauma 2002;53 (2) 219- 224
PubMed Link to Article
Haider  AHEfron  DTHaut  ER  et al.  Mortality in adolescent girls vs boys following traumatic shock: an analysis of the National Pediatric Trauma Registry. Arch Surg 2007;142 (9) 875- 880
PubMed Link to Article
Baker  SPO'Neill  B The injury severity score: an update. J Trauma 1976;16 (11) 882- 885
PubMed Link to Article
Champion  HRSacco  WJCopes  WS  et al.  A revision of the Trauma Score. J Trauma 1989;29 (5) 623- 629
PubMed Link to Article
Association for the Advancement of Automotive Medicine, The Abbreviated Injury Scale 1990—Update 98.  Barrington, IL Association for the Advancement of Automotive Medicine1990;
Centers for Disease Control, Recommended framework for presenting injury mortality data. MMWR Recomm Rep 1997;461- 30
Hollis  SLecky  FYates  DW  et al.  The effect of pre-existing medical conditions and age on mortality after injury. J Trauma 2006;61 (5) 1255- 1260
PubMed Link to Article
Harlan  LCGreene  ALClegg  LX  et al.  Insurance status and the use of guideline therapy in the treatment of selected cancers. J Clin Oncol 2005;23 (36) 9079- 9088
PubMed Link to Article
Haas  JSGoldman  L Acutely injured patients with trauma in Massachusetts: differences in care and mortality, by insurance status. Am J Public Health 1994;84 (10) 1605- 1608
PubMed Link to Article
Ayanian  JZWeissman  JSChasan-Taber  S  et al.  Quality of care by race and gender for congestive heart failure and pneumonia. Med Care 1999;37 (12) 1260- 1269
PubMed Link to Article
White  FAFrench  DZwemer  FL  Jr  et al.  Care without coverage: is there a relationship between insurance and ED care? J Emerg Med 2007;32 (2) 159- 165
PubMed Link to Article
Smith  WRBetancourt  JRWynia  MK  et al.  Recommendations for teaching about racial and ethnic disparities in health and health care. Ann Intern Med 2007;147 (9) 654- 665
PubMed Link to Article

Figures

Place holder to copy figure label and caption
Figure 1.

Flowchart of patient selection criteria. NTDB indicates National Trauma Data Bank; ISS, Injury Severity Score; “Other” * indicates patients who indicated racial or ethnic group other than African American, Hispanic, or white on survey.

Graphic Jump Location
Place holder to copy figure label and caption
Figure 2.

Adjusted odds of mortality by race and insurance status (n = 311 503). Values in parentheses are 95% confidence intervals. * Indicates reference group.

Graphic Jump Location

Tables

Table Graphic Jump LocationTable 2. Injury Severity Characteristics Stratified by Race and Insurance Status

References

 Agency for Healthcare Research and Quality. National Healthcare Disparities Report. Rockville, MD Agency for Healthcare Research and Quality2003;
Lucas  FLStukel  TAMorris  AM  et al.  Race and surgical mortality in the United States. Ann Surg 2006;243 (2) 281- 286
PubMed Link to Article
Marquez de la Plata  CHewlitt  Mde Oliveira  A  et al.  Ethnic differences in rehabilitation placement and outcome after TBI. J Head Trauma Rehabil 2007;22 (2) 113- 121
PubMed Link to Article
Haider  AHEfron  DTHaut  ER  et al.  Black children experience worse clinical and functional outcomes after traumatic brain injury: an analysis of the National Pediatric Trauma Registry. J Trauma 2007;62 (5) 1259- 1263
PubMed Link to Article
Chen  AYSchrag  NMHalpern  MT  et al.  The impact of health insurance status on stage at diagnosis of oropharyngeal cancer. Cancer 2007;110 (2) 395- 402
PubMed Link to Article
Richardson  LCTian  LVoti  L  et al.  The roles of teaching hospitals, insurance status, and race/ethnicity in receipt of adjuvant therapy for regional-stage breast cancer in Florida. Am J Public Health 2006;96 (1) 160- 166
PubMed Link to Article
Kelz  RRGimotty  PAPolsky  D  et al.  Morbidity and mortality of colorectal carcinoma surgery differs by insurance status. Cancer 2004;101 (10) 2187- 2194
PubMed Link to Article
Roetzheim  RGPal  NTennant  C  et al.  Effects of health insurance and race on early detection of cancer. J Natl Cancer Inst 1999;91 (16) 1409- 1415
PubMed Link to Article
Shafi  Sde la Plata  CMDiaz-Arrastia  R  et al.  Ethnic disparities exist in trauma care. J Trauma 2007;63 (5) 1138- 1142
PubMed Link to Article
Lim  HJHoffmann  RBrasel  K Factors influencing discharge location after hospitalization resulting from a traumatic fall among older persons. J Trauma 2007;63 (4) 902- 907
PubMed Link to Article
Susman  MDiRusso  SMSullivan  T  et al.  Traumatic brain injury in the elderly: increased mortality and worse functional outcome at discharge despite lower injury severity. J Trauma 2002;53 (2) 219- 224
PubMed Link to Article
Haider  AHEfron  DTHaut  ER  et al.  Mortality in adolescent girls vs boys following traumatic shock: an analysis of the National Pediatric Trauma Registry. Arch Surg 2007;142 (9) 875- 880
PubMed Link to Article
Baker  SPO'Neill  B The injury severity score: an update. J Trauma 1976;16 (11) 882- 885
PubMed Link to Article
Champion  HRSacco  WJCopes  WS  et al.  A revision of the Trauma Score. J Trauma 1989;29 (5) 623- 629
PubMed Link to Article
Association for the Advancement of Automotive Medicine, The Abbreviated Injury Scale 1990—Update 98.  Barrington, IL Association for the Advancement of Automotive Medicine1990;
Centers for Disease Control, Recommended framework for presenting injury mortality data. MMWR Recomm Rep 1997;461- 30
Hollis  SLecky  FYates  DW  et al.  The effect of pre-existing medical conditions and age on mortality after injury. J Trauma 2006;61 (5) 1255- 1260
PubMed Link to Article
Harlan  LCGreene  ALClegg  LX  et al.  Insurance status and the use of guideline therapy in the treatment of selected cancers. J Clin Oncol 2005;23 (36) 9079- 9088
PubMed Link to Article
Haas  JSGoldman  L Acutely injured patients with trauma in Massachusetts: differences in care and mortality, by insurance status. Am J Public Health 1994;84 (10) 1605- 1608
PubMed Link to Article
Ayanian  JZWeissman  JSChasan-Taber  S  et al.  Quality of care by race and gender for congestive heart failure and pneumonia. Med Care 1999;37 (12) 1260- 1269
PubMed Link to Article
White  FAFrench  DZwemer  FL  Jr  et al.  Care without coverage: is there a relationship between insurance and ED care? J Emerg Med 2007;32 (2) 159- 165
PubMed Link to Article
Smith  WRBetancourt  JRWynia  MK  et al.  Recommendations for teaching about racial and ethnic disparities in health and health care. Ann Intern Med 2007;147 (9) 654- 665
PubMed Link to Article

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