Investigators analyzed 20 years of data on over 50,500 U.S. adults drawn from the National Health and Nutrition Examination Surveys (NHANES) and found that, in the overall population, body mass index and hemoglobin A1c were significantly increased between 1999 and 2018, while serum total cholesterol and cigarette smoking were significantly decreased. Mean systolic blood pressure decreased between 1999 and 2010, but then increased after 2010.
The mean age- and sex-adjusted estimated 10-year risk for atherosclerotic cardiovascular disease (ASCVD) was consistently higher in Black participants vs. White participants, but the difference was attenuated after further adjusting for education, income, home ownership, employment, health insurance, and access to health care.
“These findings are helpful to guide the development of national public health policies for targeted interventions aimed at eliminating health disparities,” Jiang He, MD, PhD, Joseph S. Copes Chair and professor of epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, said in an interview.
“Interventions on social determinants of cardiovascular health should be tested in rigorous designed intervention trials,” said Dr. He, director of the Tulane University Translational Science Institute.
The study was published online Oct. 5 in JAMA.
‘Flattened’ CVD mortality?
Recent data show that the CVD mortality rate flattened, while the total number of cardiovascular deaths increased in the U.S. general population from 2010 to 2018, “but the reasons for this deceleration in the decline of CVD mortality are not entirely understood,” Dr. He said.
Moreover, “racial and ethnic differences in CVD mortality persist in the U.S. general population [but] the secular trends of cardiovascular risk factors among U.S. subpopulations with various racial and ethnic backgrounds and socioeconomic status are [also] not well understood,” he added. The effects of social determinants of health, such as education, income, home ownership, employment, health insurance, and access to health care on racial/ethnic differences in CVD risk, “are not well documented.”
To investigate these questions, the researchers drew on data from NHANES, a series of cross-sectional surveys in nationally representative samples of the U.S. population aged 20 years and older. The surveys are conducted in 2-year cycles and include data from 10 cycles conducted from 1999-2000 to 2017-2018 (n = 50,571, mean age 49.0-51.8 years; 48.2%-51.3% female).
Every 2 years, participants provided sociodemographic information, including age, race/ethnicity, sex, education, income, employment, housing, health insurance, and access to health care, as well as medical history and medication use. They underwent a physical examination that included weight and height, blood pressure, lipid levels, plasma glucose, and hemoglobin A1c.
Social determinants of health
Between 1999-2000 and 2017-2018, age- and sex-adjusted mean BMI and hemoglobin A1c increased, while mean serum total cholesterol and prevalence of smoking decreased (all P < .001).
Age- and sex-adjusted 10-year atherosclerotic cardiovascular disease (ASCVD) risk decreased from 7.6% (6.9%-8.2%) in 1999-2000 to 6.5% (6.1%-6.8%) in 2011-2012, with no significant changes thereafter.
When the researchers looked at specific racial and ethnic groups, they found that age- and sex-adjusted BMI, systolic BP, and hemoglobin A1c were “consistently higher” in non-Hispanic Black participants compared with non-Hispanic White participants, but total cholesterol was lower (all P < .001).
Participants with at least a college education or high family income had “consistently lower levels” of cardiovascular risk factors. And although the mean age- and sex-adjusted 10-year risk for ASCVD was significantly higher in non-Hispanic Black vs. non-Hispanic White participants (difference, 1.4% [1.0%-1.7%] in 1999-2008 and 2.0% [1.7%-2.4%] in 2009-2018), the difference was attenuated (by –0.3% in 1999-2008 and 0.7% in 2009-2018) after the researchers further adjusted for education, income, home ownership, employment, health insurance, and access to health care.
The differences in cardiovascular risk factors between Black and White participants “may have been moderated by social determinants of health,” the authors noted.
Provide appropriate education
Commenting on the study in an interview, Mary Ann McLaughlin, MD, MPH, associate professor of medicine, cardiology, Icahn School of Medicine at Mount Sinai, New York, pointed out that two important cardiovascular risk factors associated with being overweight – hypertension and diabetes – remained higher in the Black population compared with the White population in this analysis.
“Physicians and health care systems should provide appropriate education and resources regarding risk factor modification regarding diet, exercise, and blood pressure control,” advised Dr. McLaughlin, who was not involved with the study.
“Importantly, smoking rates and cholesterol levels are lower in the Black population, compared to the White population, when adjusted for many important socioeconomic factors,” she pointed out.
Dr. McLaughlin added that other “important social determinants of health, such as neighborhood and access to healthy food, were not measured and should be addressed by physicians when optimizing cardiovascular risk.”
The research reported in this publication was supported by the National Heart, Lung, and Blood Institute and by the National Institute of General Medical Sciences. One of the researchers, Joshua D. Bundy, PhD, was supported by a grant from the National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health and Human Development. Dr. He and the other coauthors and Dr. McLaughlin reported no relevant financial relationships.
A version of this article first appeared on Medscape.com.