Yet Another Difference in the Partisan Divide: COVID-19 Mortality


University of Maryland researchers calculate difference in COVID-19 mortality rates in counties depending on popular vote in the 2020 presidential election.

The partisan divide in the U.S. is not limited to how people vote and beliefs about gun control, abortion and the 2020 election, according to research findings published in the June issue of Health Affairs.

Using results from the 2020 presidential election and the New York Times COVID-19 mortality database, researchers at the University of Maryland calculated that strongly Republican counties (70% and higher of the popular vote was for Donald Trump) had a higher mortality rate from COVID-19 than strongly Democratic counties (30% and less for Trump). More specifically, they found that the mortality rate in strongly Republican counties was 72.9 deaths per 100,000 population higher than the strongly Democratic counties. The difference between Republican leaning counties (50% to less than 70% of the popular vote for Trump) and the strongly Democratic counties was 33.52 deaths per 100,000.

Neil Jay Sehgal

Neil Jay Sehgal

Neil Jay Sehgal, Ph.D., M.P.H., an assistant professor at the University of Maryland School of Public Health, and colleagues, said only 10% of the difference could be explained by differences in vaccination rates. They made adjustments for age and other factors that might explain the mortality difference. They concluded that most of the difference is likely explained by differences in public health measures designed to prevent COVID-19 transmission.

From a policy perspective, Sehgal and his co-authors said their results called into question the “federalist” model of states and localities being in charge of public health prevention. “Although these ‘laboratories of democracy’ are valued in the U.S. democratic federalist republic, the federalist model Is not well suited to addressing a deadly pandemic,” they wrote.

The findings by Sehgal and his colleagues show that COVID-19 mortality difference flipped in late 2020 and early 2021. Their research shows that between April and September 2020, a period that encompassed the first two waves of the pandemic, Republican counties had lower death rates than Democratic ones, although the difference did not meet the standard thresholds for assessing statistical validity. During the winter months, the Republican counties started to catch up and starting in April 2021, the death rates were clearly higher in Republican counties than in Democratic ones.

During the early months of the pandemic in 2020, Republic and Democratic counties employed similar mitigation strategies like lockdowns, mask requirements and capacity restrictions, Sehgal said. COVID-19 vaccines started becoming available at the end of 2020. After that and as the trajectory of Republican and Democratic counties diverged, “political beliefs altered compliance with public health mandates, vaccine uptake and social distancing measures,” wrote Sehgal and his co-authors.

Notably, deaths in Republican majority counties were not limited to the unvaccinated or those unwilling to engage in social distancing or masking. For the period studied, health care workers, children, immunocompromised people and elderly residents located in counties with higher Republican vote share were found to be more likely to die from COVID-19, regardless of their own personal beliefs.

The study included COVID-19 deaths through Oct. 31, 2021. Sehgal and his co-authors say the Republican-Democratic differences in mortality rate may have widened since because of the Omicron variant and vaccination playing an even larger role in protecting people against severe cases of COVID-19.

Sehgal acknowledged some of the limitations of their research. For example, voting patterns may have shifted at the county level since the 2020 presidential election. It is also possible that the effects of COVID-19 vaccination on mortality rates were underestimated because many people weren’t eligible to be vaccinated till the spring months of 2021.

Overall, the study findings indicate that it is likely that personal political opinions have the capacity to compromise the effectiveness of both local policies and public health measures, wrote Sehgal and his co-authors.

“It is likely that Democratic counties benefited more from public health guidance and mandates because residents were more willing to comply with those mandates, trust government messaging, and adhere to public health guidance,” they wrote.

They recommend that the federal government provide clearer science-based health guidance and continue investing in health communication, the community health workforce and other public health supports to increase vaccine uptake in underserved and hesitant populations.

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