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Heart Disease Death Rates Among Blacks and Whites Aged ≥35 Years — United States, 1968–2015 | MMWR

Heart Disease Death Rates Among Blacks and Whites Aged ≥35 Years — United States, 1968–2015 | MMWR

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MMWR Surveillance Summaries
Vol. 67, No. SS-5
March 30, 2018



Heart Disease Death Rates Among Blacks and Whites Aged ≥35 Years — United States, 1968–2015

Surveillance Summaries / March 30, 2018 / 67(5);1–11


Miriam Van Dyke, MPH1; Sophia Greer, MPH2; Erika Odom, PhD2; Linda Schieb, MSPH2; Adam Vaughan, PhD2; Michael Kramer, PhD1; Michele Casper, PhD2 (View author affiliations)
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Abstract

Problem/Condition: Heart disease is the leading cause of death in the United States. In 2015, heart disease accounted for approximately 630,000 deaths, representing one in four deaths in the United States. Although heart disease death rates decreased 68% for the total population from 1968 to 2015, marked disparities in decreases exist by race and state.
Period Covered: 1968–2015.
Description of System: The National Vital Statistics System (NVSS) data on deaths in the United States were abstracted for heart disease using diagnosis codes from the eighth, ninth, and tenth revisions of the International Classification of Diseases (ICD-8, ICD-9, and ICD-10) for 1968–2015. Population estimates were obtained from NVSS files. National and state-specific heart disease death rates for the total population and by race for adults aged ≥35 years were calculated for 1968–2015. National and state-specific black-white heart disease mortality ratios also were calculated. Death rates were age standardized to the 2000 U.S. standard population. Joinpoint regression was used to perform time trend analyses.
Results: From 1968 to 2015, heart disease death rates decreased for the total U.S. population among adults aged ≥35 years, from 1,034.5 to 327.2 per 100,000 population, respectively, with variations in the magnitude of decreases by race and state. Rates decreased for the total population an average of 2.4% per year, with greater average decreases among whites (2.4% per year) than blacks (2.2% per year).
At the national level, heart disease death rates for blacks and whites were similar at the start of the study period (1968) but began to diverge in the late 1970s, when rates for blacks plateaued while rates for whites continued to decrease. Heart disease death rates among blacks remained higher than among whites for the remainder of the study period. Nationwide, the black-white ratio of heart disease death rates increased from 1.04 in 1968 to 1.21 in 2015, with large increases occurring during the 1970s and 1980s followed by small but steady increases until approximately 2005. Since 2005, modest decreases have occurred in the black-white ratio of heart disease death rates at the national level. The majority of states had increases in black-white mortality ratios from 1968 to 2015. The number of states with black-white mortality ratios >1 increased from 16 (40%) to 27 (67.5%).
Interpretation: Although heart disease death rates decreased both for blacks and whites from 1968 to 2015, substantial differences in decreases were found by race and state. At the national level and in most states, blacks experienced smaller decreases in heart disease death rates than whites for the majority of the period. Overall, the black-white disparity in heart disease death rates increased from 1968 to 2005, with a modest decrease from 2005 to 2015.
Public Health Action: Since 1968, substantial increases have occurred in black-white disparities of heart disease death rates in the United States at the national level and in many states. These increases appear to be due to faster decreases in heart disease death rates for whites than blacks, particularly from the late 1970s until the mid-2000s. Despite modest decreases in black-white disparities at the national level since 2005, in 2015, heart disease death rates were 21% higher among blacks than among whites. This study demonstrates the use of NVSS data to conduct surveillance of heart disease death rates by race and of black-white disparities in heart disease death rates. Continued surveillance of temporal trends in heart disease death rates by race can provide valuable information to policy makers and public health practitioners working to reduce heart disease death rates both for blacks and whites and disparities between blacks and whites.
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Introduction

Heart disease is the leading cause of death in the United States (1). In 2015, heart disease accounted for approximately 630,000 deaths, representing one in four deaths (1). Nationally, racial disparities in heart disease mortality have persisted since at least the 1980s (2) and have been documented as the leading contributor to differences between blacks and whites in life expectancy (3). The National Academy of Medicine (NAM), formerly known as the Institute of Medicine, and Healthy People 2020 have both called for increased understanding of health disparities by race and geographic area (4,5). NAM has called for surveillance systems that can measure disparities in heart disease by race and by contextual factors such as place of residence (4). Documenting trends in heart disease death rates by race and state provides valuable information to policy makers and public health practitioners for promoting continued decreases both for blacks and whites, along with decreases in disparities between blacks and whites, in heart disease mortality.
Previous studies have largely focused on differences in heart disease death rates between blacks and whites nationally, not by state, and for a limited period (6–9). Although these studies indicate that disparities in heart disease mortality between blacks and whites persist, little is known about how these racial differences vary by state and over an extended period. Moreover, reports that documented trends in race-specific heart disease death rates by geographic area (10) often did not measure trends in racial disparities over time and by location. This study provides a historical perspective on black-white disparities in heart disease death rates nationally and by state in the United States from 1968 to 2015.
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Methods

Data Source

CDC’s National Vital Statistics Surveillance System (NVSS) collects birth and death records of U.S. residents. Death records are classified by underlying cause and other contributing causes of death and include limited demographic data such as sex, age, race, and state of residence. Death records were obtained for U.S. decedents aged ≥35 years who died during 1968–2015. The study period began in 1968 because it was the first year that mortality data were coded according to the International Classification of Diseases, Eighth Revision (ICD-8), and the accuracy of microdata files could not be ascertained for the years 1959–1967 (11). This study was restricted to persons aged ≥35 years because the etiology for heart disease among younger persons often is different than that for older persons (12). Bridged-race postcensal estimates for 2011–2015, bridged-race intercensal estimates for 2000–2010, and intercensal and unbridged estimates for 1968–1999 from NVSS and the U.S. Bureau of the Census (13,14) were used for population estimates to calculate death rates per 100,000 population. Rates were age standardized using direct standardization to the 2000 U.S. standard population with six 10-year age groups.

Case Definition and Classification

Heart disease deaths were defined as those with an underlying cause of death in the ICD category of diseases of the heart (e.g., coronary heart disease, heart failure, atrial fibrillation, and myocardial infarction) because this category has been the most inclusive and has had the most consistent definition of heart disease over time. The following ICD codes were used for the eighth, ninth, and tenth ICD revisions: ICD-8 (1968–1978): 390–398, 402, 404, and 410–429; ICD-9 (1979–1998): 390–398, 402, 404, and 410–429; and ICD-10 (1999–2015): I00–I09, I11, I13, and I20–I51 (Table 1). Revisions of the ICD with changes in coding rules can cause temporal discontinuities in cause-of-death trends. However, comparability ratios (which measure the extent of such discontinuities) for heart disease ICD codes are very close to 1 for the entire study period, indicating that changes in the ICD do not substantially affect the ability to compare heart disease death rates across ICD revisions (15–17).

Analysis

Annual age-standardized heart disease death rates were calculated using statistical software at the national level, by state, and for the District of Columbia (DC) from 1968 to 2015. State-level heart disease death rates can be statistically unreliable when based on small numbers; therefore, heart disease death rates were not calculated for specific state-race groups with <20 deaths. Death rates for the total population included all racial/ethnic subgroups in the United States. Race-specific rates were calculated for blacks and whites only.
The ratio of black-white heart disease death rates was examined over time. To estimate the standard error of the ratio, the age-standardized rates were assumed to be normally distributed, and the variance of the ratio was computed using the delta method. Using the standard errors of the ratios, 95% confidence intervals (CIs) were calculated. Black-white mortality rate ratios with CIs that include 1 represent approximately equal rates of heart disease deaths among blacks and whites. Ratios with upper CIs <1 indicate lower heart disease death rates among blacks than whites, and ratios with lower CIs >1 indicate higher heart disease death rates among blacks than whites. A relative measure of disparity was used to estimate black-white disparities in heart disease mortality to standardize the change over time in disparities across states (18).
Joinpoint regression was used to model heart disease death rate trends and black-white heart disease mortality ratio trends over time. The program fits a model and uses permutation tests to determine statistically significant changes in temporal trends, identifying the joinpoint (i.e., point at which the slope of the trend line changes). For the total population and by race for each state and nationwide, the annual percentage change (APC) for each joinpoint trend segment and the average annual percentage change (AAPC) for the trend for the entire study period were calculated. Trends were modeled using a log linear model, and the modified Bayesian information criterion (19) was used to detect statistically significant changes in trends. Statistical significance was set at p<0.05. Calculated heart disease death rates were graphed by year for the total population and by race. Quartiles of heart disease death rates were created for the maps based on the distribution of rates for blacks and whites combined. Calculated black-white heart disease mortality ratios were graphed by year. Rates and ratios were mapped by state using ArcGIS 10.4.1.
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Results

Heart Disease Death Rates by Race

Heart disease death rates were similar for blacks and whites at the beginning of the study period. During the study period, both blacks and whites experienced substantial decreases in heart disease death rates, from 1,071.6 to 396.0 per 100,000 for blacks and from 1,032.3 to 326.3 per 100,000 for whites. (Table 2). However, overall decreases in heart disease death rates, measured as the AAPC, were slower among blacks (AAPC = 2.2% per year) than whites (AAPC = 2.4% per year). Consequently, after 1975, heart disease death rates were consistently higher among blacks than whites.
Temporal patterns of decreases in heart disease death rates varied between blacks and whites. Among whites, a steady decrease in death rates occurred during 1968–2000 (APC = 2.2% per year), after which the decrease accelerated during 2000–2010 (APC = 3.9% per year) but slowed substantially during 2010–2015 (APC = 1.0% per year) (Figure 1). Among blacks, a slower decrease occurred than among whites during 1968–1998 (1.4% per year), although the decrease accelerated during 1998–2015 (APC = 3.4% per year). The trends (Figure 1) indicate that since approximately 2010, the decreases in heart disease death rates for blacks and whites have leveled.
Nationally, the black-white mortality ratio increased from the late 1970s to the mid-2000s (Figure 2). The black-white mortality ratio peaked in 2005 (1.31), followed by a modest decrease to 1.21 in 2015. The recent decrease in the black-white ratio reflects a larger rate decrease among blacks than whites during that period. Overall, the black-white disparity in heart disease death rates increased 16.3% from 1968 to 2015.

Heart Disease Death Rates by Race and State

Of the 51 geographic areas (50 states and DC), 39 states and DC had sufficient numbers of heart disease deaths among blacks to calculate statistically reliable heart disease death rates. All 51 geographic areas had sufficient numbers among whites. In 1968, heart disease death rates for blacks ranged from 562.3 (Minnesota) to 1,601.7 (Rhode Island) per 100,000 population and from 768.1 (New Mexico) to 1,207.2 (Illinois) for whites (Table 2). In 2015, heart disease death rates for blacks ranged from 200.4 (Oregon) to 515.6 (Arkansas) and for whites from 198.1 (DC) to 446.3 (Oklahoma) (Table 2). Both for blacks and whites, the geographic pattern of heart disease death rates changed over time. In 1968, the highest rates for blacks were concentrated primarily in the mid-Atlantic states, along with several midwestern and northeastern states, and the highest rates for whites were concentrated primarily in the Northeast and parts of the Midwest (Figure 3). In 2015, the highest rates for blacks were concentrated primarily in the northeastern, midwestern, and southern states, and the highest rates for whites were concentrated primarily in the south-central states. Comparison of U.S. maps showing heart disease death rates among blacks and whites in 2015 indicates that among blacks, a total of 23 of the state rates were in the highest quartile (based on the joint distribution of rates for blacks and whites), whereas among whites, a total of 11 of the state rates were in the highest quartile.
During 1968–2015, the AAPC in heart disease death rates varied by state both for blacks and whites (Table 2). Among blacks, the AAPC ranged from −4.5 per year (Rhode Island) to −1.3 per year (Arkansas and Nevada). Among whites, the AAPC ranged from −3.4 per year (DC) to −1.6 per year (Oklahoma). For the total population, the AAPC ranged from −3.0 per year (Massachusetts) to −1.6 per year (Arkansas and Oklahoma). State-specific graphs showing temporal trends in heart disease mortality by race and the black-white mortality ratio are available (Supplementary Figures, https://stacks.cdc.gov/view/cdc/51537). Trends in heart disease death rates for blacks and whites and black-white mortality ratios varied by state.
The black-white patterns for some states were similar to those at the national level; heart disease death rates for blacks were the same as for whites in 1968 but then diverged, with blacks having slower decreases and higher rates than whites for the remainder of the study period. For most states, the black-white mortality ratio increased from 1968 to 2015; however, in Massachusetts and Rhode Island, the ratio decreased; in some states, little change occurred. In 1968, black-white mortality ratios ranged from 0.64 in Minnesota to 1.38 in Rhode Island, and in 2015 they ranged from 0.69 in Rhode Island to 2.42 in DC (Table 3).
In 1968, 48% of the states (19 states) had black-white mortality ratios with CIs that included 1, indicating that distinguishing between black and white death rates in those states is not statistically possible (Figure 4). In 1968, approximately 13% of the states (five states) had black-white ratios <1, and approximately 40% of the states (16 states) had black-white ratios >1. By 2015, black-white mortality ratios had increased or remained unchanged for most states, resulting in 68% of the states (27 states) having black-white mortality ratios >1. Only 25% of the states (10 states) had ratios with CIs that included 1, and 8% of the states (three states) had black-white ratios <1. Overall, from 1968 to 2015, the number of states with black-white mortality ratios that were >1 increased from 16 (40%) to 27 (68%). In 1968, states with black-white heart disease mortality ratios that were >1 were concentrated primarily in the Midwest to the mid-Atlantic and Texas, Louisiana, Florida, and Nebraska, whereas in 2015, states with black-white ratios >1 were in parts of the Northeast, much of the Midwest and South, and parts of the West.
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Discussion

This report documents historical trends in black-white disparities in heart disease mortality, along with the total and race-specific trends in heart disease death rates, at both the national and state levels from 1968 to 2015. Nationally, although heart disease death rates decreased for the total population, the patterns of decrease differed by race and state. Heart disease death rates among blacks and whites decreased at comparable rates during the early portion of the study (1968 until the late 1970s) but then diverged from the late 1970s until the mid-2000s. During this time, whites experienced steady decreases in heart disease death rates. Blacks also experienced decreases; however, the rate of decrease was consistently slower than that for whites. This produced an increase in the black-white heart disease mortality ratio of 26% from 1.04 in 1976 to a peak of 1.31 in 2005, which was followed by a modest decrease in the black-white ratio of 7.6% to 1.21 in 2015. Overall, the black-white heart disease mortality ratio increased 16% from 1968 to 2015. At the state level, the majority of states experienced diverging trends in heart disease death rates by race and increases in black-white mortality ratios from 1968 to 2015; however, variations occurred among the states (Supplementary Figures, https://stacks.cdc.gov/view/cdc/51537) in the direction and magnitude of black-white disparities over time.
The decrease in heart disease death rates observed in this report for the total U.S. population has been well documented (2). From 1950 to 1996, heart disease death rates decreased 56% in the United States (20). Differences in heart disease mortality decreases by race have not been well documented at the state level, although several studies have documented spatiotemporal trends in heart disease mortality by race at the county level (6,8,10). A report documenting national trends in ischemic heart disease death rates for blacks and whites from 1981 to 1995 found similar racial disparities in the rates of decrease for ischemic heart disease death rates (6).
Factors contributing to national decreases in heart disease mortality in the United States are estimated to be approximately equally attributable to prevention and advances in treatment (21,22). From 1980 to 2000, approximately half of the reduction of coronary heart disease deaths in the United States was reported to be attributed to improvements in medical treatment, such as antihypertensive medications, cholesterol-lowering drugs, and revascularization for chronic angina (21). The other 50% of the decrease in heart disease deaths was reported to be a function of improvements in risk factors related to heart disease (e.g., reductions in cigarette smoking, hypertension, hyperlipidemia, and physical inactivity) (20,21). Black-white differences in the magnitude and patterns of decrease in heart disease death rates observed in this report suggest that blacks have not benefitted equally from the improvements in prevention and treatment that have contributed to the overall decreases in heart disease deaths in the United States. Specifically, differential or delayed access to or adoption of heart disease prevention and treatment across time among blacks compared with whites could be contributing to the observed increases in black-white disparities (23). In recent years, the modest improvements in the black-white heart disease mortality ratio coincide with a leveling off of decreases both for blacks and whites. This leveling might result from possible slowed progression in the favorable trends of heart disease prevention or treatment along with increases in the prevalence of certain risk factors (e.g., obesity) (21) both for blacks and whites. Additional research is needed to examine the conditions contributing to these patterns.
Although research examining whether factors contributing to temporal decreases in heart disease death rates vary by race is limited, racial disparities in heart disease risk factors, prevention, and treatment have been documented. On average, when compared with whites, blacks have higher prevalences of cardiovascular risk factors such as obesity (26), diabetes (27), hypertension (28), physical inactivity (25), and short sleep duration (24). With respect to clinical treatment of heart disease, blacks have been less likely to receive certain cardiovascular interventions and procedures (e.g., angiography, percutaneous transluminal coronary angioplasty, coronary artery bypass grafting, and thrombolysis therapy) than whites with similar characteristics (29). In the United States, socioeconomic factors, such as income, education, and access to adequate health care insurance (23,30–32), and race-related factors, including discrimination (33,34) and racial residential segregation (35,36), have been documented as underlying causes of racial differences in heart disease prevention and treatment (37).
Because certain risk factors for adult heart disease are evident years before clinical manifestation, a life course perspective might increase understanding of temporal patterns of death rates and disparities (38). For example, childhood and adolescent obesity (39,40), smoking (41), and childhood family socioeconomic status (42) are each predictors of incident cardiovascular disease in adults. Moreover, racial differences in these risk factors might exist between generations. An age-period cohort study examining heart disease death rates among U.S. blacks and whites from 1973 to 2010 found markedly increased rates of heart disease deaths specifically among blacks in the cohort born during 1920–1960 (8). More research is needed to examine how racial differences in risk factors across the life course and generations affect racial disparities in heart disease prevention and treatment.
The comparison of geographic patterns of black-white disparities in heart disease death rates at the beginning and end of the study period demonstrates widespread increases in black-white disparity among the states. The number of states with black-white heart disease mortality ratios that were >1 increased from 16 (40%) in 1968 to 27 (67.5%) by 2015. Although the black-white heart disease mortality ratio increased from 1968 to 2015 for most states, in several states, including Connecticut, Delaware, Kentucky, Massachusetts, Nebraska, Oregon, Rhode Island, Washington, and West Virginia, the black-white ratio remained equal or became favorable for blacks, with blacks having similar or lower heart disease death rates than whites. Examination of the race-specific trends in these states (Supplementary Figures, https://stacks.cdc.gov/view/cdc/51537), along with the race-specific 1968 and 2015 maps, reveals various circumstances that might have contributed to these results, such as a slowdown in the rate of decrease in heart disease death rates among whites compared with blacks in some states or an increase in the rate of decrease among blacks compared with whites in other states. In addition, in certain instances, heart disease death rates are high both for blacks and whites, resulting in black-white ratios that are approximately 1 (e.g., South Carolina in 1968 and Alabama in 2015). For states with high heart disease death rates both for blacks and whites, state-level policies and social norms that affect access to and adoption of heart disease prevention and treatment both for blacks and whites are particularly important to consider.
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Limitations

The findings in this report are subject to several limitations. First, this report only examines race-specific patterns of heart disease death rates among blacks and whites (28). Patterns for Hispanics, American Indians/Alaska Natives, and Asians/Pacific Islanders are not included because these racial/ethnic categories were not consistently reported on death certificates for the entire study period (43). Second, statistically stable trends of heart disease death rates among blacks, along with trends in black-white ratios, could not be calculated in 11 states because of the small populations of blacks in those states. Even in states for which both black and white rates could be calculated, small populations in some states resulted in black-white rate ratios with large CIs and wide variations across years. In these cases, interpretations of trends should be made cautiously and include examination of annual trends in race-specific heart disease death rates (Supplementary Figures, https://stacks.cdc.gov/view/cdc/51537). Third, because of the focus on geographic stratification and the extended study period, small, age-stratified populations of blacks limited the ability to conduct this analysis by age group (9). Fourth, because heart disease mortality data in this report are from death certificates, differences in adherence to reporting procedures for cause of death could lead to the misclassification of cause of death. Potential misclassification of heart disease subtypes is minimized in this report given the use of the broad ICD category “diseases of the heart” (44,45). Fifth, the use of statistical testing (via 95% CIs) to categorize states with increased, equal, or decreased black-white ratios might limit the ability to identify states with meaningful black-white disparities that are not statistically significant because of insufficient statistical power (i.e., small populations of blacks or whites). Sixth, as with any study of long-term temporal trends, the use of bridged-race estimates for the years 2000 and later could introduce a bias in race-specific trends if those persons reassigned a race category through the race-bridging method had self-identified as a different race category in previous census data. Although the direction of the potential bias is unknown, the magnitude of its impact is likely minimal given the small percentage of the population reporting multiple races (46). In addition, the bridged-race estimates provide the best population estimates available for comparison over time. Finally, this report examines black-white disparities in heart disease mortality at the state level and therefore does not include substate geographic variations that might exist within each state.
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Conclusion

This report highlights important black-white disparities in heart disease death rates at the national and state level in the United States from 1968 to 2015. Although heart disease death rates decreased both for blacks and whites during the study period and modest improvements occurred recently in the black-white heart disease mortality ratio, black-white disparities are persistent and concerning. Future research and initiatives should focus on improving national and state-level black-white disparities related to heart disease, which supports Healthy People 2020 and NAM goals. The Million Hearts initiative (http://millionhearts.hhs.gov/learn-prevent/index.html), launched in 2012, outlines proven strategies to prevent myocardial infarctions, strokes, and deaths from cardiovascular disease and includes specific initiatives focused on the needs within black communities (47). In addition to using evidence-based strategies, standard treatment protocols, and culturally relevant tools to promote heart-healthy living, ensuring that heart disease prevention and treatment efforts are designed to benefit all groups equally is important. Ongoing attention to eliminating racial disparities in social determinants of health also are important to address racial disparities in heart disease prevention and treatment. The elimination of racial disparities in heart disease death rates, along with continued decreases in heart disease death rates for all persons in the United States, is important for the overall state of health. The trends in black-white disparities in heart disease death rates observed in this report highlight the importance of continued surveillance of these trends at the national and state level.
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Acknowledgments

Kya Grooms, Department of Epidemiology, Rollins School of Public Health, Emory University; Sharon Murphy, Division for Heart Disease and Stroke Prevention, National Center for Chronic Disease Prevention and Health Promotion, CDC.
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1Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia; 2Division for Heart Disease and Stroke Prevention, National Center for Chronic Disease Prevention and Health Promotion, CDC, Atlanta, Georgia
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