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Motor vehicle crash deaths and Premature mortality

Where Motor vehicle crash deaths is higher, Premature mortality tends to be higher. The link is moderate: +0.54 across 2,480 counties, on a scale from −1 (opposite) to +1 (in step). That figure compares places with the same population density, income and education, so those differences can't explain it. It holds inside states too. Measured separately within each of 36 states, the middle value of the link is +0.56.

Holds after adjusting

Every place, plotted

One dot for each place reporting both measures. Hover over or tap a dot to see its name and values. The thin line is the straight line that best fits the dots. The bold line, shown for counties, is the link after adjusting for density, income and education. A dot far from the lines is a place that does not follow the pattern.

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What each measure is

Motor vehicle crash deaths

Deaths in car and other motor vehicle crashes per 100,000 people.

County Health Rankings · County Health Rankings v039

Premature mortality

Deaths before age 75 per 100,000 people. It is adjusted so places with older or younger populations can be compared fairly.

County Health Rankings · County Health Rankings v127

Highest and lowest

Where each measure is highest and lowest among the places reporting both (2023), with the other measure beside it. This is shown for every size of place where both are published. Metro-area values are added up from their counties. A measure that cannot be added up across counties, such as a middle value (median), has no metro figure. Counts are shown per 1,000 residents, since raw totals would only list the largest places. Cities and towns and ZIP codes are shown where the Census survey or the CDC publishes them; most other sources stop at the county. They are shown for places of 5,000 residents or more, and only where the survey’s margin of error is small enough for the figure to be usable. The CDC publishes its health estimates for cities in a version adjusted for age, so places with older or younger people can be compared fairly, but not for ZIP codes.

Counties

By motor vehicle crash deaths

Motor vehicle crash deathsPremature mortality
Highest
Big Horn County, MT90968
Oglala Lakota County, SD86.41,585
Todd County, SD80.61,413
Jackson County, SD76.31,152
Dewey County, SD68.31,606
Lowest
New York County, NY2.71259
Arlington County, VA2.73195
Loudoun County, VA3.46181
Kings County, NY3.66339
Richmond County, NY3.83329

By premature mortality

Motor vehicle crash deathsPremature mortality
Highest
Dewey County, SD68.31,606
Oglala Lakota County, SD86.41,585
Sioux County, ND48.21,416
Todd County, SD80.61,413
Roosevelt County, MT33.81,337
Lowest
Eagle County, CO6.24167
Loudoun County, VA3.46181
Fairfax County, VA4.35182
Summit County, UT6.46192
Arlington County, VA2.73195
States

By motor vehicle crash deaths

Motor vehicle crash deathsPremature mortality
Highest
Mississippi25.5629
South Carolina20.8501
Alabama20.7569
Arkansas19.8552
New Mexico19.8531
Lowest
New York5.9336
Massachusetts6.01303
District of Columbia6.39486
Rhode Island6.89331
New Jersey6.98334

By premature mortality

Motor vehicle crash deathsPremature mortality
Highest
Mississippi25.5629
West Virginia15.9625
Alabama20.7569
Kentucky17.4565
Louisiana18563
Lowest
Massachusetts6.01303
Hawaii7.56310
Minnesota8.2315
Utah8.72317
Connecticut8.54323
Metro areas

By motor vehicle crash deaths

Motor vehicle crash deathsPremature mortality
Highest
Palatka, FL45.5689
Gallup, NM42.31,079
Lumberton, NC41.4825
Show Low, AZ40.2851
Selma, AL39.2865
Lowest
Amherst Town-Northampton, MA5.04284
New York-Newark-Jersey City, NY-NJ5.04314
Boston-Cambridge-Newton, MA-NH5.14277
Pullman, WA5.54338
Provo-Orem-Lehi, UT5.83282

By premature mortality

Motor vehicle crash deathsPremature mortality
Highest
Gallup, NM42.31,079
Clarksdale, MS27.91,070
Middlesborough, KY29929
Cleveland, MS29.1927
Greenwood, MS28.8891
Lowest
Edwards, CO6.24167
Jackson, WY-ID24184
Heber, UT8.92202
Bozeman, MT9.84207
San Jose-Sunnyvale-Santa Clara, CA7.35214

Counties furthest from the pattern

Compared with the straight line that best fits all 2,482 counties: the five with far more premature mortality than their motor vehicle crash deaths would suggest, and the five with far less.

Motor vehicle crash deathsPremature mortality
Above the line
Roosevelt County, MT33.81,337
Sioux County, ND48.21,416
Petersburg city, VA22.31,097
Dewey County, SD68.31,606
McDowell County, WV27.71,106
Below the line
Meade County, KS62.8507
Hartley County, TX41.4307
Norton County, KS42.4322
Polk County, NE46.5408
Beaver County, OK52472

Two series, one county

Both measures over time for a county you pick. The two charts are stacked, so they share only the years along the bottom. You can pick from the thirty largest counties reporting both. This panel covers 2010–2024, and a measure published only once shows as a single dot.

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Every version of the link

Each row measures the same link, from −1 to +1, in a different way. If the rows mostly agree, the link does not depend on one choice of method.

Before adjusting for anything+0.6902,480 counties reporting both
After adjusting for density, income and education+0.541the part of the link that is not just how urban, rich and educated a place is
Also adjusting for population size+0.536size taken out as well as density
Also comparing only within each state+0.444each county is compared only with others in its own state, so this is no longer a comparison between states
Giving bigger counties more weight+0.544the adjusted link for the average resident rather than the average county. With this weighting, the data counts for about 276 equally weighted counties
Middle value inside single states+0.560the link worked out inside each of 36 states with at least 20 counties reporting
Using ranks, after adjusting+0.496uses each county’s rank, not its value, so a few extreme counties cannot create the link

How much to believe it

Could it be chance?

The p-value is the chance of seeing a link this strong if there were really none. A value of 0.05 or less means the link is unlikely to be chance. Very small values are written in short form: 3.1e-16 means 0.00000000000000031, and the bigger the number after “e-”, the smaller the value. Treating every county as a separate case gives p = 5.5e-188. But counties in the same state tend to resemble each other, so the better figure allows for that: p = 1.5e-11. The site tested 20,910 pairs, and testing so many turns up some flukes. The q-value allows for that too. For this pair it is 6.2e-187.

Do nearby places look alike?

Moran’s I measures how much nearby places look alike: 0 means no map pattern, and higher means neighbours are more similar. For the part of each county that the adjustment leaves unexplained, it is +0.31 (p = 0.001). That unexplained part still clusters on the map. So some regional factor shared by both measures is not accounted for.

Did they change together?

The figures above compare counties at one moment. This asks a different question: where motor vehicle crash deaths rose most, did premature mortalitymove too? Each county’s change is compared with the average change in its own state. That takes out ups and downs that hit a whole region at once. Each change is the gap between two estimates that both contain some error. That error pulls these links towards zero, so a weak one is weak partly for that reason. The q column shows whether a link could be a fluke, allowing for the many pairs tested: 0.05 or less means it is unlikely to be chance.

PeriodCountiesChange togetherWithin statesq
2014–2019 the main test: each Census survey figure averages five years, and these two do not overlap; before the pandemic2,380+0.17+0.171.5e-9
2019–2023 a repeat check: its two five-year survey figures both include 2019, and it covers the COVID years2,410+0.21+0.184.5e-5

Measured over the nearest years published: Motor vehicle crash deaths: 2013–2019 for the 2014–2019 row; Premature mortality: 2013–2019 for the 2014–2019 row; Motor vehicle crash deaths: 2019–2022 for the 2019–2023 row; Premature mortality: 2019–2022 for the 2019–2023 row.

In counties where one changed more, the other tended to move the same way, compared with other counties in the same state (r = +0.17). The same holds in the second period. How change is measured.

Related pairs

Association only. Nothing here shows that either measure changes the other. This describes counties, not the people in them. Two measures going together across places does not mean the same people have both. How the US county data works · Explore Motor vehicle crash deaths and Premature mortality