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What’s the most common cause of death in your county?

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What will kill you might depend on where you live, a new study suggests

Heart problems are common in Southern counties and suicide in Western counties

CNN —  

Deaths due to heart problems tend to be highest in counties along the southern half of the Mississippi River.

Violent deaths tend to be common in Western counties, and deaths from mental and substance abuse disorders tend to be more common in Kentucky and West Virginia counties than others.

Those are just a few of the trends that emerged in a new study that revealed the major causes of death for counties across the United States. The study was published in the journal JAMA on Tuesday.

“We know that unequal access and quality of care create health disparities in the US for many causes of death, while other causes are linked to risk factors or policies. The results of this study prompt future research to further identify what drives health disparities in our country,” said Dr. Christopher Murray, a professor and director of the Institute for Health Metrics and Evaluation at the University of Washington, who was a co-author of the new study.

Death by the numbers

For the study, researchers analyzed death records from the National Center for Health Statistics’ National Vital Statistics System. The records included data on 80,412,524 deaths that occurred from 1980 through 2014 in the United States.

The data included the county of residence for each person who died, at the time of their death, but did not include data on deaths of Americans outside the United States.

After taking a close look at which causes of deaths occurred in which counties, the researchers found trends in how many deaths were due to tumors; cardiovascular disease; diabetes and diseases that affect the urinary tract, genitals, blood, thyroid or pancreas; neurological disorders; suicide and violence; chronic respiratory diseases; transportation-related injuries; mental and substance disorders; chronic liver diseases; and infectious diseases.

The 2014 mortality rates and geographic patterns in the data are a good indicator of current trends, Murray said.

The findings appear to be the most comprehensive yet to describe how a broad set of causes of death differ across counties, said Ellen Meara, a professor at the Dartmouth Institute for Health Policy and Clinical Practice in New Hampshire, who was not involved in the new study.

“It is unique in its ability to track cause-specific death rates in small areas over a long time period, three decades,” Meara said of the study.

Regions with highest cancer, heart-related deaths

The study showed very high mortality rates due to tumors, especially when cancerous, in counties along the southern half of the Mississippi River, eastern Kentucky, western West Virginia and western Alaska.

However, many counties in states stretching from Idaho and Wyoming in the north to western Texas in the south had lower-than-average mortality rates from tumors, according to the results.

Cancer death rates between 2009 and 2013 were highest in Union County, Florida; Wade Hampton Census Area, Alaska; Woodson County, Kansas; Powell County, Kentucky; and other nearby counties, according to separate statistics from the National Cancer Institute’s state cancer profiles.

For cardiovascular disease, mortality rates decreased by about 50% overall between 1980 and 2014, but the rate of decline varied by county, according to the study. Slow rates of improvement were observed in Southern counties stretching from Oklahoma to Alabama and Kentucky.

Cardiovascular disease death rates were highest among Franklin, Louisiana; Caldwell, Louisiana; Gallatin, Kentucky; and other nearby counties from 2012 to 2014, according to separate data from the Centers for Disease Control and Prevention’s Interactive Atlas of Heart Disease and Stroke Tables.

Heart disease has consistently been the leading cause of death in the United States in recent years, with cancer as a close second, according to data released by the National Vital Statistics System in August (PDF).

The new study also showed that mortality rates due to diabetes and diseases that affect the urinary tract, genitals, blood, thyroid or pancreas were particularly high in counties in Arkansas, Louisiana and Mississippi along the Mississippi River and in counties with Native American reservations in North Dakota and South Dakota.

Large increases in deaths due to neurological disorders were observed in Southern counties stretching from eastern Texas and Oklahoma to Alabama, according to the study. Declines in mortality were found in counties in the West, an area reaching from central Idaho and western Montana to central Colorado.

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Increased mortality rates due to chronic respiratory diseases were observed in a prominent cluster of counties in eastern Kentucky and West Virginia and in a second cluster in southeastern Colorado, according to the new study.

The lowest mortality rates were found in counties in the District of Columbia area, the upper Midwest, southern Florida, southern Texas and central Colorado.

Chronic respiratory diseases are often linked to smoking. Other risk factors include air pollution, exposure to chemicals and dusts, and frequent lower respiratory infections in childhood.

For deaths due to mental and substance use disorders, the mortality rate increased by 188% overall between 1980 and 2014, according to the new study.

Several clusters of counties in Kentucky, West Virginia, Ohio, Indiana, western Pennsylvania and east-central Missouri saw mortality rates rise by more than 1,000%.

According to a separate Morbidity and Mortality Weekly Report released by the CDC in January, West Virginia topped the list of states with the highest rates of drug overdose deaths in the country in 2014, followed by New Mexico, New Hampshire, Kentucky and Ohio.