Increasing Mortality From Premature Coronary Artery Disease in Women in the Rural United States.

Background Previous reports have described a leveling off of mortality from premature coronary artery disease (CAD). In recent years, the prevalence of cardiovascular risk factors has increased in rural communities and young adults. Methods and Results We extracted CAD mortality rates from the Centers for Disease Control and Prevention Wide-Ranging Online Data for Epidemiologic Research (CDC WONDER) database from 1999 to 2017, focusing on mortality from premature CAD (defined as <65 years of age in women) and urban-rural differences. Variations in mortality rates over time, assessed with Joinpoint regression modeling, are expressed as estimated annual percentage change (95% CI) and stratified by urbanization, sex, age, and race. Age-adjusted mortality rates decreased for women and men. Stratification by urbanization revealed that premature CAD mortality is stagnating among women in rural areas. However, this stagnation conceals a statistically significant increase in CAD mortality rates since 2009 in women aged 55 to 64 years (estimated annual percentage change: +1.4%; 95% CI, +0.3% to +2.5%) and since 1999 in women aged 45 to 54 years (estimated annual percentage change: +0.6%; 95% CI, +0.2% to 1.0%). Since 1999, mortality has been stagnating in the youngest group (aged 35-44 years; estimated annual percentage change: +0.2%; 95% CI, -0.4% to +0.8%). Stratification by race indicated an increase in mortality rates among white rural women. Premature CAD mortality remains consistently higher in the rural versus urban United States, regardless of sex, race, and age group. Conclusions Premature CAD mortality rates have declined over time. However, stratification by sex and urbanization reveals disparities that would otherwise remain concealed: CAD mortality rates have increased among women from rural areas since at least 2009.

Clinical Perspective

What Is New?

We analyzed trends in mortality rates from premature coronary artery disease (CAD) in the United States from 1999 to 2017.

After stratification by sex and urbanization, an increase in CAD mortality was found among women residing in the rural United States.

Women in urban areas and men (in urban and rural areas) showed opposite trends.

What Are the Clinical Implications?

These findings call for an intensification of public health efforts regarding cardiovascular risk factor awareness, assessment, and control, especially for young women in rural communities.

Because premature CAD is a result of exposure to cardiovascular risk factors during adolescence and early adulthood, one wonders if efforts for primary and secondary prevention are enough or if a focus on primordial prevention is necessary.

coronary artery disease

Center of Disease Control and Prevention

estimated annual percent shange

Introduction

Coronary artery disease (CAD) remains the leading cause of death in the United States despite considerable reductions in mortality over the past several decades. These trends have been attributed to improved primary and secondary prevention efforts and advances in diagnosis and treatment of CAD. However, recent reports have suggested a leveling off of CAD mortality rates, especially in young individuals, including women.1, 2 People residing in rural US communities appear to be disproportionately affected by these trends.3 The population count in rural communities is roughly 60 million (about 20% of the US population).4 This segment of the population is experiencing increasing disparity in prevalence of cardiovascular risk factors compared with urban counterparts.5, 6 The burden of cardiovascular risk factors among young adults is growing.7 Furthermore, rising hospitalization rates for myocardial infarction (MI) in young women have been reported recently.8

Taken together, these recent reports raise the suspicion that CAD mortality rates in young individuals, especially young women, and in residents of rural communities may have been negatively affected even further in recent years. Limited data are available about recent trends in CAD mortality in these populations. Recognizing urban–rural differences has important implications for optimization and allocation of healthcare resources and prevention programs.

We sought to analyze the most recent mortality rates from premature CAD, defined by the American College of Cardiologists and the American Heart Association as <65 years of age in women and <55 years in men,9 stratified by urbanization, age, sex, and race.

Methods

Anonymized data and materials are available at Centers for Disease Control and Prevention Wide‐Ranging Online Data for Epidemiologic Research (CDC WONDER) and can be accessed at (https://wonder.cdc.gov/). The statistical program Joinpoint is also freely available from the National Institutes of Health (https://surve​illan​ce.cancer.gov/joinp​oint/download).

We extracted CAD mortality rates from the multiple‐cause‐of‐death files of CDC WONDER from 1999 to 2017. This publicly accessible database provides mortality data on the US population collected by state registries and entered into the National Vital Statistics System. Demographic data and underlying cause of death are indicated on death certificates. Institutional review board approval was waived because all data are deidentified and publicly available.

CAD was defined as International Classification of Diseases, Tenth Revision (ICD‐10) codes I20–I25. We focused on mortality from premature CAD (defined as <65 years of age in women9) and in three 10‐year age strata (35–44, 45–54, and 55–64 years). Premature CAD in men is defined as <55 years of age; the stratum of men aged 55 to 64 years is reported for comparison purposes.9

Age‐adjusted mortality rates were calculated with the 2000 US Census as the default population. We further stratified mortality by sex and urbanization (metropolitan, medium‐small towns, rural). This represents a condensed version of the 2013 National Center for Health Statistics (NCHS) Urban–Rural Classification Scheme used by the CDC10: “metro” (large central metro plus large fringe metro), “med‐small” (medium metro plus small metro), “rural” (micropolitan plus noncore). We stratified by race according to the categories provided by CDC WONDER: “black or African American” and “white.” The category “Hispanic origin” was not analyzed to avoid bias, as Hispanic ethnicity is likely to be misclassified on death certificates.11 The analysis was confined to the 1999–2017 period because urbanization data are not available before 1999 and 2017 represents the latest available data.

The Joinpoint software (v4.5.0.1; National Cancer Institute) was used to assess variations in the estimated annual percentage change (EAPC). EAPC represents the change in mortality occurring during a certain time period, expressed as a percentage and averaged over the specified time period; for example, if mortality increases by 7% during a 10‐year period, the EAPC for that period is +0.7%. Joinpoint uses a Monte Carlo permutation test to identify time points (“joinpoints”) where the trend, or magnitude of the trend, changes significantly from the preceding one (using a t test), then fitting the simplest model by applying the smallest number of trend segments, referred to as “period” in this article. An EAPC and 95% CI are calculated for each period.

We assumed a Poisson distribution (events occur randomly and independently), and a maximum of 3 joinpoints were prespecified (fewer joinpoints might conceal a change in trend, whereas >3 were unnecessary because they did not reveal additional inflection points in exploratory analyses). This method is commonly used to minimize bias when assessing trends in incidence or mortality rates.1, 2, 12 A P value <0.05 was considered statistically significant.

Results

Age‐adjusted mortality from premature CAD has been decreasing at similar rates for men and women, slowing down after 2010. This decrease is more pronounced in women (EAPC: −0.8%; 95% CI, −1.3% to −0.3%) versus men (EAPC: −1.5%; 95% CI, −1.8% to −1.2%), highlighted in Figure 1 and Table 1. When stratified by urbanization, stagnation is evident among women in the rural and medium‐small town groups (since 1999 and 2009, respectively). Further stratification by age shows that stagnation in mortality rates for rural women conceals an increase in CAD mortality rates in 55‐ to 64‐year‐olds (EAPC: +1.4%; 95% CI, +0.2% to +2.5%) since 2010 and in the 45‐ to 54‐year‐old group, uninterrupted since 1999 (EAPC: +0.6%; 95% CI, +0.2% to +1.0%). The youngest group (aged 35–44 years) of rural women experienced a stagnation in mortality rate for the entire period (EAPC: +0.2%; 95% CI, −0.4% to +0.8%), as displayed in Table 2 and Figure 2. The stagnation in age‐adjusted mortality rates seen in medium‐small towns is driven since 2008 by stagnation in the group aged 55 to 64 years (EAPC: −0.5%; 95% CI, −0.9% to 0.0%; Figure 2 and Table 2.

Figure 1

Age‐adjusted mortality from premature CAD in 35‐ to 64 year‐olds by sex and urbanization.

Detailed data are presented in Table 

Table 1

Age‐Adjusted Mortality From Premature CAD in People Aged 35 to 64 Years, Stratified by Sex and Urbanization

Urbanization Area	Period, y	EAPC	95% CI		Note
			Lower	Upper
Women
All regions	1999–2010	−3.8a	−4.0	−3.5	…
	2010–2017	−0.8a	−1.3	−0.3	…
Metro	1999–2011	−4.5a	−4.7	−4.3	…
	2011–2017	−1.4a	−2.1	−0.8	…
Medium‐Small	1999–2009	−3.4a	−3.8	−3.0	…
	2009–2017	−0.3b	−0.9b	0.2b	Stagnationb
Rural	1999–2009	−2.4a	−3.0	−1.8	…
	2009–2017	0.8b	−0.1b	1.7b	Stagnationb
Men
All regions	1999–2010	−3.5a	−3.6	−3.4	…
	2010–2017	−1.5a	−1.8	−1.2	…
Metro	1999–2011	−3.9a	−4.0	−3.7	…
	2011–2017	−1.9a	−2.3	−1.5	…
Medium‐Small	1999–2009	−3.3a	−3.5	−3.1	…
	2009–2017	−1.3a	−1.5	−1.0	…
Rural	1999–2008	−2.9a	−3.2	−2.6	…
	2008–2017	−0.4b	−0.9b	0.0b	Stagnationb

Results from statistical analysis (Joinpoint software). CAD indicates coronary artery disease; and EAPC, estimated annual percentage change.

P<0.05.

EAPCs relevant for the discussion.

Table 2

Age‐Specific Mortality From Premature CAD by Sex, Age Group, and Urbanization

Urbanization Area	Period, y	EAPC	95% CI		Note
			Lower	Upper
Women
35–44 y
Metro	1999–2004	0.9	−0.8	2.6	…
	2004–2007	−9.3	−16.4	−1.5	…
	2007–2017	−1.5a	−2.2	−0.8	…
Medium‐Small	1999–2002	4.3	−2.9	12.0	…
	2002–2017	−2.1a	−2.7	−1.4	…
Rural	1999–2017	0.2b	−0.4b	0.8b	Stagnationb
45–54 y
Metro	1999–2006	−2.3a	−2.9	−1.7	…
	2006–2010	−4.6a	−6.8	−2.4	…
	2010–2017	−2.0a	−2.7	−1.4	…
Medium‐Small	1999–2017	−0.7a	−1.0	−0.5	…
Rural	1999–2017	0.6a , b	0.2b	1.0b	Significant increaseb
55–64 y
Metro	1999–2010	−5.5a	−5.8	−5.1	…
	2010–2017	−1.6a	−2.3	−0.8	…
Medium‐Small	1999–2008	−5.3a	−5.8	−4.9	…
	2008–2017	−0.5b	−0.9b	0.0b	Stagnationb
Rural	1999–2010	−4.1a	−4.7	−3.5	…
	2010–2017	1.4a , b	0.3b	2.5b	Significant increaseb
Men
35–44 y
Metro	1999–2017	−3.2a	−3.4	−2.9	…
Medium‐Small	1999–2003	0.1	−2.1	2.3	…
	2003–2017	−3.0a	−3.3	−2.6	…
Rural	1999–2003	3.1a	1.1	5.1	…
	2003–2009	−4.7a	−6.1	−3.4	…
	2009–2012	2.3	−4.8	9.9	…
	2012–2017	−3.3a	−4.9	−1.6	…
45–54 y
Metro	1999–2006	−2.9a	−3.3	−2.5	…
	2006–2009	−4.5a	−7.6	−1.3	…
	2009–2017	−2.8a	−3.2	−2.5	…
Medium‐Small	1999–2017	−2.2a	−2.3	−2.0	…
Rural	1999–2017	−1.4a	−1.5	−1.2	…
55–64 y
Metro	1999–2004	−5.0a	−5.6	−4.3	…
	2004–2011	−3.8a	−4.3	−3.3	…
	2011–2017	−1.4a	−1.9	−0.9	…
Medium‐Small	1999–2006	−4.7a	−5.0	−4.4	…
	2006–2011	−2.4a	−3.1	−1.7	…
	2011–2017	−0.3b	−0.7b	0.1b	Stagnationb
Rural	1999–2008	−4.2a	−4.6	−3.9	…
	2008–2017	0.0b	−0.4b	0.3b	Stagnationb

Results from statistical analysis (Joinpoint software). CAD indicates coronary artery disease; and EAPC, estimated annual percentage change.

P<0.05.

EAPCs relevant for the discussion results from the statistical analysis.

Figure 2

Age‐specific mortality from premature CAD according to age groups, sex, and urbanization.

Detailed data are presented in Table 

In men, the age‐adjusted mortality rates revealed stagnation in rural areas from 2008 onward (EAPC: −0.4%; 95% CI, −0.9% to 0.0%: Figure 1 and Table 1. This finding was driven by stagnation among the 55‐ to 64‐year‐olds since 2008 (EAPC: 0.0%; 95% CI, −0.4 to +0.3%). In addition, this same age group witnessed stagnation of mortality rates in medium‐small towns from 2011 (EAPC: −0.3%; 95% CI, −0.7 to +0.1%; Figure 2 and Table 2. Although the age cutoff for the premature CAD definition in men is <55 years, the group aged 55 to 64 years is reported for comparison.

When the analysis was not limited to the premature CAD age range but included ages ≥35 years, the disparities and the increase in CAD mortality rate remained concealed (Figure 3 and Table 3). This was related to the relatively high number of deaths from CAD in the group aged >65 years. Mortality rates with a uniform scale are shown in Figure 4 for comparison.

Figure 3

Age‐adjusted mortality from CAD in people aged ≥35 years, stratified by urbanization.

Detailed data are presented in Table 

Table 3

Age‐Adjusted Mortality From CAD in People Aged ≥35 Years, Stratified by Urbanization and Sex

Urbanization Area	Period, y	EAPCa	95% CI
			Lower	Upper
Aged ≥35 y
Overall
Women	1999–2002	−5.2	−2.3	−5.6
	2002–2010	−5.9	−6.3	−5.4
	2010–2017	−3.5	−4	−3
Men	1999–2002	−3.6	−4.9	−2.4
	2002–2007	−5.4	−6.2	−4.5
	2007–2012	−3.8	−4.7	−2.9
	2012–2017	−2.1	−2.7	−1.5
Metro
Women	1999–2002	−3.9	−5.3	−2.5
	2002–2012	−6.1	−6.4	−5.8
	2012–2017	−3.4	−4.3	−2.6
Men	1999–2002	−3.9	−5.3	−2.5
	2002–2009	−5.4	−5.9	−4.9
	2009–2014	−3.7	−4.6	−2.7
	2014–2017	−2.0	−3.5	−0.4
Medium‐Small
Women	1999–2003	−4.2	−5	−3.3
	2003–2009	−6.1	−6.8	−5.4
	2009–2017	−3.1	−3.5	−2.7
Men	1999–2003	−3.8	−4.6	−3
	2003–2007	−5.6	−6.9	−4.3
	2007–2012	−3.3	−4.1	−2.4
	2012–2017	−1.8	−2.4	−1.2
Rural
Women	1999–2010	−4.6	−4.9	−4.3
	2010–2017	−2.5	−3.2	−1.7
Men	1999–2009	−4.3	−4.6	−4
	2009–2017	−1.8	−2.3	−1.4
Aged >65 y
Metro
Women	1999–2002	−3.8	−5.2	−2.4
	2002–2012	−6.3	−6.6	−6
	2012–2017	−3.8	−4.6	−2.9
Men	1999–2002	−3.9	−5.4	−2.5
	2002–2009	−5.7	−6.2	−5.2
	2009–2014	−3.9	−5	−2.8
	2014–2017	−2.1	−3.8	−0.4
Medium‐Small
Women	1999–2003	−4.2	−5.2	−3.3
	2003–2009	−6.5	−7.2	−5.7
	2009–2017	−3.6	−4.0	−3.2
Men	1999–2003	−3.9	−4.8	−3
	2003–2007	−6.1	−7.6	−4.5
	2007–2012	−3.6	−4.6	−2.5
	2012–2017	−2.1	−2.8	−1.4
Rural
Women	1999–2011	−4.9	−5.2	−4.6
	2011–2017	−2.9	−3.9	−2
Men	1999–2010	−4.5	−4.8	−4.2
	2010–2017	−2.0	−2.6	−1.4

Results from statistical analysis (Joinpoint software). CAD indicates coronary artery disease; and EAPC, estimated annual percentage change.

All EAPCs, P<0.05.

Figure 4

Age‐specific mortality rates according to age groups, sex, and urbanization. These are the same data reported in Figure 2 and Table 2, but presented with the same scale for comparison purposes.

Stratification by race shows higher CAD mortality rates for black patients throughout the entire period. The increase in mortality rates in rural areas was driven by a mortality increase in white women beginning in 2009 (EAPC: +0.9%; 95% CI, 0.0 to +1.8%), whereas black women experienced a numerical increase in mortality rates that was not statistically significant (EAPC: +0.5%; 95% CI, −2.0 to +0.4%). CAD mortality rates have been stagnating for both black and white men in rural areas (since 2010 and 2009, respectively). In addition, black men in medium‐small towns had a more recent onset of stagnation beginning in 2012 (Figure 5 and Table 4). To provide a better geographical overview, a map of the NCHS Urban–Rural Classification Scheme used by the CDC is provided in Figure 6.

Figure 5

Age‐adjusted mortality from premature CAD in 35‐ to 64‐year‐olds by race and urbanization.

Table 4

Age‐Adjusted Mortality From Premature CAD in People Aged 35 to 64 Years, Stratified by Urbanization, Race, and Sex

Race/Sex	Period, y	EAPC	95% CI		Note
			Lower	Upper
Overall
White women	1999–2009	−3.5a	−3.8	−3.2	…
	2000–2007	−0.7a	−1.2	−0.3	…
Black women	1999–2001	−1.7	−5.2	2.5	…
	2001–2011	−5.3a	−5.7	−5.0	…
	2011–2017	−1.2a	−1.9	−0.4	…
White men	2009–2009	−3.4a	−3.6	−3.3	…
	2009–2017	−1.7a	−1.9	−1.4	…
Black men	1999–2011	−4.3a	−4.6	−4.0	…
	2011–2017	−1.1a	−2.0	−0.2	…
Metro
White women	1999–2010	−4.3a	−4.6	−4.0	…
	2010–2017	−1.5a	−2.1	−0.9	…
Black women	1999–2001	−1.7	−6.0	2.7	…
	2001–2012	−5.5a	−5.8	−5.1	…
	2012–2017	−1.3a	−2.4	−0.2	…
White men	1999–2011	−3.7a	−3.9	−3.6	…
	2011–2017	−2.0a	−2.4	−1.5	…
Black men	1999–2005	−3.8a	−4.6	−3.0	…
	2005–2010	−5.4a	−6.9	−3.9	…
	2010–2017	−1.7a	−2.4	−1.1	…
Medium‐Small
White women	1999–2007	−3.6a	−4.1	−3.1	…
	2007–2017	−0.7a	−1.1	−0.3	…
Black women	1999–2009	−4.8a	−5.5	−4.1	…
	2009–2017	−1.2a	−2.2	−0.1	…
White men	1999–2009	−3.2a	−3.4	−3.0	…
	2009–2017	−1.4a	−1.6	−1.1	…
Black men	1999–2002	−3.1a	−5.3	−0.8	…
	2002–2008	−4.8a	−5.8	−3.8	…
	2008–2012	−2.6a	−4.8	−0.3	…
	2012–2017	0.2b	−0.8b	2.5b	Stagnationb
Rural
White women	1999–2009	−2.0a	−2.6	−1.4	…
	2009–2017	0.9a , b	0.0b	1.8b	Significant increaseb
Black women	1999–2010	−4.9a	−6.0	−3.7	…
	2010–2017	0.5b	−2.0b	0.4b	Stagnationb
White men	1999–2009	−2.8a	−3.1	−2.5	…
	2009–2017	0.4b	−0.8b	0.1b	Stagnationb
Black men	1999–2010	−4.1a	−4.7	−3.4	…
	2010–2017	−0.7b	−2.1b	0.7b	Stagnationb

Results from statistical analysis (Joinpoint software). CAD indicates coronary artery disease; and EAPC, estimated annual percentage change.

P<0.05.

EAPCs relevant for the discussion results from the statistical analysis.

Figure 6

Urbanization, as defined by the Centers for Disease Control and Prevention ( https://www.cdc.gov/nchs/data_acces​s/urban_rural.htm ).

CAD mortality rates have been consistently higher in rural than urban areas since 1999. The gap between urban and rural mortality rates has widened over time, especially in women. In 1999, the mortality rate for men aged 35 to 64 years in rural areas was 133.4 per 100 000 (95% CI, 131.0–135.7) and 111.2 per 100 000 (95% CI, 110.0–112.5) in metropolitan areas (absolute urban–rural difference of 22.2 per 100 000, 16.6% relative difference). In 2017, mortality for rural men was 96.7 per 100 000 (95% CI, 94.7–98.6) and 61.9 per 100 000 (95% CI, 61.1–62.3) for metropolitan men (absolute urban–rural difference of 34.8 per 100 000, 36.0% relative difference). In women aged 35 to 64, in 1999, the mortality rate in rural areas was 45.4 per 100 000 (95% CI, 44.1–46.8) and 39.0 per 100 000 (95% CI, 38.3–39.8) in metropolitan areas (urban–rural absolute difference 6.4 per 100 000, relative difference 16.9%). By 2017, the mortality rate for rural women was 37.6 per 100 000 (95% CI, 36.4–38.8) and for metropolitan women was 20.7 per 100 000 (95% CI, 20.2–21.1), amounting to an urban–rural absolute difference of 16.9 per 100 000 and a relative difference of 45.5%. These diverging trends in urban–rural mortality rates are even more pronounced in the younger age groups (35–44 and 45–54 years; Figures 1 and 2).

Discussion

In the United States, overall trends in premature death from CAD conceal considerable urban–rural disparities that become apparent when mortality is stratified by urbanization. When further stratified by sex, these trends reveal a disturbing aspect: women living in the rural United States have, for the first time, experienced an increase in premature CAD mortality. This result is in stark contrast to their metropolitan counterparts, who have experienced a virtually uninterrupted reduction in premature CAD mortality.

Increases in mortality rates often accompany increases in incidence and/or case fatality rates.13 Because there is no systematic recording of the incidence of MI and ischemic heart disease, hospitalization rates are often used as a proxy, with their own limitations. Nevertheless, recent data from representative cohorts showed an increase in the incidence of MI hospitalizations in young patients, especially young women.5, 6, 14, 15, 16 The increase in obesity prevalence has affected women more than men.7 Studies also suggested that middle‐aged women with diabetes mellitus or metabolic syndrome have up to a 5‐fold increase in the risk of CAD or acute MI compared with nondiabetic women and men.17, 18 In addition, nontraditional cardiovascular risk factors such as depression and perceived stress are also more common in young individuals, especially young women.19, 20, 21 Recent attention has been focused on neurobiological pathways as the basis for the increase in cardiovascular risk and will hopefully lead to improved awareness and treatment.22, 23

These latest trends are mirrored in the cardiovascular risk profiles of young patients hospitalized for MI, especially women.8, 24 Overall, the burden of cardiovascular risk factors in young patients with MI is increasing.8, 24, 25 The recognition of these differences in MI presentation in young women26 is offset by differences in treatment27 and general underrepresentation in trials studying risk factors, outcomes, and treatments.28, 29

Contrary to common perceptions, young patients (aged 35–54 years) comprise about a third of the hospitalizations for acute MI (33% in men and 31% in women in the 2010–2014 period; in women, this proportion was 21% in the 1995–1999 time period) according to a recent study.8 This result is in contrast to the Medicare population's hospitalization rate, which declined >20% in the 2001–2010 period.30 Of note, these adverse trends have occurred despite considerable improvements in both acute and chronic care of patients with CAD.

Our analyses also highlighted important racial disparities showing higher CAD mortality rates in black patients compared with white patients and stagnation of CAD mortality rates among young black people living in rural areas. This result points toward a similar direction as previous studies.31

Our study has some limitations that need to be addressed. It is possible that misclassification bias is present given inaccuracy on death certificates.32, 33, 34 Studies addressing misclassification bias have reported a tendency toward overestimation in mortality from CAD by as much as 20%,34 but a study addressing misclassification in out‐of‐hospital deaths showed a high degree of agreement between physician review and death certificate diagnosis.35 Another study found that misclassification affected mostly older (aged >85 years) decedents, older women in particular.32 We also cannot exclude that part of the effect on mortality is caused by cohort effect, which has implications for future studies: The increase in mortality reported in this study might lead to reduced CAD mortality in older age groups in the future, because high‐risk individuals are already deceased. Another potential bias that we cannot account for is competing risk. Nevertheless, it seems unlikely that competing risk inflated the adverse trends in premature CAD mortality, especially in the most recent years, which have seen a rise in death rates due to drug overdose and suicide: a recent report from the CDC showed a 2.6‐fold increase in drug‐overdose deaths in women aged 30 to 64 years during the 1999–2017 period.36 Finally, the data presented do not allow inferences regarding causality or other contributing factors because no information about risk factors, socioeconomic factors, healthcare access, and other items linked to the death certificate are available.

It is important to consider that these findings derive from publicly available data stemming from the CDC. Therefore, these data are not from a population sample that is assumed to be generalizable to the whole US population but rather from a census of all premature CAD deaths in the United States; this aspect confers high external validity. Moreover, the consistent coding with ICD‐10 for the entire period avoids potential misclassification due to overlap with ICD‐9 time periods. Another strength of our study is the nonbiased estimation of EAPC by Joinpoint regression analysis. Finally, to the best of our knowledge, this study is the first to show an increase in mortality rates from premature CAD in a segment of the US population.

Because death from premature CAD is the result of the exposure to cardiovascular risk factors accrued during childhood, adolescence, and young adulthood, these findings call for an intensification of public health efforts targeting prevention and cardiovascular risk factor control in young Americans, especially young women and residents of rural areas. Furthermore, one wonders if a focus on primary prevention is enough or if an additional, equally (if not more) intense focus on primordial prevention is necessary.37, 38

Conclusions

Disparities in the mortality rates from premature CAD are considerable across sex, urbanization, and race. Women living in the rural United States who are aged 45 to 54 and 55 to 64 years have experienced an increase in CAD mortality since 1999 and 2009, respectively, whereas the youngest group (35‐ to 44‐year‐olds) have experienced stagnating CAD mortality rates since 1999. Stagnation of CAD mortality rates was found among men aged 55 to 64 years in rural areas and medium‐small towns. These alarming trends warrant an intensification of public health efforts aimed at improving primary prevention and cardiovascular risk factor control in young women, especially those residing in rural areas.

Disclosures

None.