Roni Caryn Rabin

As the coronavirus spread across the United States, sweeping through low-income, densely populated communities, black and Hispanic patients have been dying at higher rates than white patients.

Crowded living conditions, poorer overall health and limited access to care have been blamed, among other factors. But a new study suggests that the disparity is particularly acute for black patients.

The disparity remained even after researchers took into account differences in age, sex, income and the prevalence of chronic health problems that exacerbate Covid-19, like hypertension and Type 2 diabetes.

The finding suggests that black patients may have had limited access to medical care or that they postponed seeking help until later in the course of their illness, when the disease was more advanced.

Black patients were also far less likely than white, Hispanic or Asian patients to have been tested for the virus before going to the emergency room for care.

Black patients “are coming to us later and sicker, and they’re accessing our care through the emergency department and acute care environment,” said Dr. Stephen H. Lockhart, the chief medical officer at Sutter Health in Sacramento and one of the authors of the new study.

The study, which was peer reviewed, was published in Health Affairs.

Delayed care may give the virus more time to spread through households and neighborhoods, Dr. Lockhart and his colleagues concluded. The delays also suggest that minority patients continue to face barriers despite California’s broad expansion of health insurance under the Affordable Care Act.

“How soon you access care, even supportive care, affects how you experience illness and how much pain and suffering you have,” said Kristen M.J. Azar, a research scientist at Sutter Health who was the study’s lead author.

She added, “While we don’t necessarily have treatments at this point, there are therapies being developed, and identifying people early on as these treatments become available will be important in order to prevent poor outcomes, like death and being put on ventilators.”

Dr. Clyde W. Yancy, chief of cardiology at Northwestern University’s Feinberg School of Medicine, said the granular study of patient records bolstered cruder public health reports of higher Covid-19 death rates among black Americans.

The data confirm that socioeconomic factors play an outsize role in influencing health status and vulnerability to infection, he added.

More than half of the 61 black patients who tested positive for the coronavirus were admitted to hospitals, compared with about one-quarter or fewer of the Hispanic, white and Asian patients who tested positive.

Black patients were also more likely than the others to be so sick that they required treatment in an intensive care unit.

Even after the investigators factored out a number of differences between patient groups, black patients were still 2.7 times more likely than others to require hospitalization when they sought care.

“The important thing we found in this study is that even when we were accounting for all those things, race mattered,” Dr. Lockhart said. “That’s a message that’s incredibly important as we think about going forward.”

The study was too small to detect differences in death rates among the patient groups, the authors said. In California as a whole, however, black residents are bearing a disproportionate burden of Covid-19 deaths.

Black residents make up 6 percent of the state’s population and roughly the same percentage of the state’s Covid-19 cases. But black patients represented 10.3 percent of Covid-19-related deaths as of May 13, according to the California Department of Public Health.

One limitation of the study was that researchers did not make adjustments for obesity. Rates of obesity are somewhat higher among black people, and obesity has emerged as a risk factor in patients with more severe complications from Covid-19.

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