What the data says about how dangerous bike helmets really are

Recode: For years, Americans have been told that helmets don’t prevent injuries, only prevent death.

Now, a new study from a team of researchers at the University of California, Berkeley, shows that while wearing one will save a lot of lives, it actually increases the risk of serious injuries, including those caused by falls.

In an online survey, participants reported that helmets were more likely to cause injuries, while being less effective than they were previously thought.

This led the researchers to conduct a second study to better understand how they did that.

In the new study, published in the journal Injury Prevention, the researchers looked at data from the U.S. Census Bureau’s American Community Survey from 2009 to 2020, as well as information from the Centers for Disease Control and Prevention (CDC) about injuries in the United States.

They then used that data to estimate the average number of serious head injuries per 10,000 people who wore a helmet during that time period.

The researchers found that helmets did indeed reduce the number of head injuries by about 1.8 per 10 million people, which is a reduction of almost 1 percent.

But the researchers also found that, overall, there were more serious injuries in areas with fewer helmets than in areas where there were a lot more helmets.

Overall, the data suggest that helmets have little to no significant benefit when compared to other available interventions.

The study also found evidence that wearing a helmet does not protect against all types of serious injury.

The findings were the opposite of what many other researchers have predicted.

According to the researchers, the benefits of wearing a head-protection device outweighed its risks in areas of the country with high rates of serious and non-serious injuries.

What do the numbers say?

The study authors note that it is difficult to know whether people who are most likely to fall on their heads are wearing the right helmet or not.

It could be that they are wearing it for other reasons that are not related to its effectiveness.

For example, people may not wear helmets because they are concerned that wearing them will increase the risk they will fall.

Or it could be they wear helmets as part of a larger strategy to reduce the risk that they will be struck by a vehicle.

The researchers caution that, even when the benefits are clear, wearing a full helmet could actually cause more harm than good.

They also note that the study does not fully account for how people respond to wearing helmets and what other factors may be influencing their decisions.

“There are lots of reasons why people choose not to wear helmets,” said co-author Robert F. Williams, Ph.

D., an assistant professor of preventive medicine and public health sciences.

“But this study shows that if you’re not wearing the helmet, it does more harm.”