than adults from other ethnic backgrounds.
Those are among the key findings from an analysis of nationally representative cross-sectional data that were presented during a late-breaking abstract session at the Revolutionizing Atopic Dermatitis conference in Chicago.
“In the past few years, there has been a much-needed focus on better understanding disparities in atopic dermatitis,” one of the study authors, Raj Chovatiya, MD, PhD, clinical associate professor at Chicago Medical School, Rosalind Franklin University, North Chicago, told this news organization after the conference.
Dr. Chovatiya
Dr. Raj Chovatiya
“Epidemiology is one of the key ways in which we can query differences in AD at a population level.”
Drawing from the 2021 National Health Interview Survey, the researchers identified 3103 respondents who reported being diagnosed with AD or eczema. They estimated the prevalence rates of AD for the overall population and each subgroup by dividing US frequency estimates by their corresponding US population totals and used multivariable logistic regression to assess the odds of having AD.
More than half of the respondents (1643) were aged between 18 and 64 years, 522 were aged 65 years and older, and 922 were children younger than 18 years. Overall, the prevalence of AD was 7.6% in adults aged 18-64 years and 6.1% in adults aged 65 years and older, for a weighted US estimate of 15.3 and 3.2 million, respectively. The prevalence of AD varied by race/ethnicity and was highest for those from “other single and multiple races” group (12.4%), followed by Black/African American (8.5%), White (7.7%), Asian (6.5%), American Indian/Alaskan Native (4.9%), and Hispanic (4.8%) populations.
In children, race/ethnicity prevalence were highest for those from other single and multiple races (15.2.%), followed by Black/African American (14.2%), American Indian/Alaskan Native (12%), White (10.2%), Hispanic (9.5%), and Asian (9%) populations.
When the researchers combined all age groups, they observed higher prevalence rates of AD among females than among males. However, in an analysis limited to children, the prevalence rates were similar between girls and boys (10.8% vs 10.7%, respectively), for a weighted US estimate of 7.8 million children with AD.
On multiple regression, the odds of having AD were greater among women than among men (odds ratio [OR], 1.4), among adults aged 18-64 years than among those aged 65 years and older (OR, 1.4), among those younger than 18 years than among those aged 65 years and older (OR, 2.0), and among Black/African American individuals than among White individuals (OR, 1.2). Hispanic adults had a lower risk for AD than non-Hispanic White adults (OR, 0.69) as did Asian adults than White adults (OR, 0.82).
“We found AD prevalence rates were higher in children and adult females, Hispanic adults had a lower prevalence of AD than all other adult groups, and there were numerical differences in AD prevalence across racial groups,” Dr. Chovatiya said in the interview. “While there are of course limitations to the use of any nationally representative cross-sectional dataset that requires weighting to project results from a smaller sample to reflect a larger more heterogeneous group, these results are important for us to consider targeted strategies to address AD burden.”
Jonathan I. Silverberg, MD, PhD, professor of dermatology at The George Washington University, Washington, who was asked to comment on the study, said that while the prevalence of AD in children has been well documented in prior research, “this study fills an important gap by showing us that the prevalence does remain high in adults.”
In addition, “it has not shown any evidence of AD decreasing over time; if anything, it might be slightly increasing,” he said. “We’re also seeing differences [in AD] by race and ethnicity. We have seen that demonstrated in children but [has been] less clearly demonstrated in adults.”
Eli Lilly and Company funded the analysis. Dr. Chovatiya and Dr. Silverberg disclosed ties to several pharmaceutical companies, including Eli Lilly.
A version of this article appeared on Medscape.com .