April 5, 2017 / 4:24 PM / 5 months ago

More people using seat belts in the U.S., but still not enough

(Reuters Health) - Even though a growing number of Americans are wearing seat belts, there are very few places in the U.S. where more than nine in 10 people buckle up in the front seat, a recent study suggests.

Overall, about 86 percent of Americans said they always used a seat belt in 2012, an increase of 8.4 percent from 2002, the study found.

Despite this progress, only 2.2 percent of U.S. counties have managed to achieve a government safety goal for reducing crash deaths: getting at least 92 percent of drivers and front-seat passengers to buckle up for every ride.

“Seat belts save lives,” said lead study author Dr. Jacob Sunshine of the University of Washington in Seattle.

“The challenge is how to encourage the drivers and riders who don’t use a safety belt every time they ride in a car to change their behavior,” Sunshine said by email. “This could be achieved through enhanced law enforcement and/or educational programs that clearly show the harms of riding without a seat belt.”

In 2015, deaths from motor vehicle crashes had the largest proportionate one-year increase since 1966, and 2016 appears to have logged even more fatalities, researchers note in the journal Health Affairs.

Seat belts can reduce crash fatalities by as much as 40 to 60 percent, the study authors note.

That message appears to resonate more in states that give drivers more legal reasons to listen to it, the study suggests.

Counties with less seat belt use tended to be in North Dakota, South Dakota, Idaho, Wyoming, Montana, Utah, Nebraska and Alaska. All of these states have so-called “secondary enforcement” laws prohibiting traffic stops just for failure to wear a seat belt; instead drivers in these states can only be ticketed for seat belt violations if they got pulled over for another reason.

Conversely, counties that had higher seat belt use were in North Carolina, California, Maryland and metropolitan areas of Texas, all states that had so-called “primary enforcement” laws on the books allowing traffic stops just for failure to wear a seat belt.

Seat belt compliance rates were more than 10 percentage points higher in counties with laws permitting tickets just for not buckling up, the study found. Currently, 34 states and the District of Columbia have these laws on the books.

Women tended to wear seat belts more often than men: 90 percent of the time versus 82 percent of the time, the study also found.

But men improved more during the study period, with compliance going up by 11 percent from 2002 to 2012 compared to a 6 percent gain for women.

The study isn’t a controlled experiment designed to prove that seat belts save lives or that specific law enforcement policies directly influence seat belt use. Researchers also didn’t examine crash or fatality data.

Even so, the findings add to growing evidence suggesting that seat belt laws can be effective at getting more drivers and passengers to buckle up, said Dr. Lois Lee, an emergency medicine physician and researcher at Boston Children’s Hospital who wasn’t involved in the study.

The scant number of counties meeting that 92 percent U.S. target for seat belt use might be explained in part by a lack of awareness of the state laws, Lee said by email.

“Often people don't know the enforcement level - primary or secondary - in their state, and the law is variably enforced,” Lee said. “Thus people don't always have a strong incentive, except the interest of their own health and the health of their passengers, to buckle up every time.”

SOURCE: bit.ly/2mW6P5S Health Affairs, online April 3, 2017.

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