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Nearly 1 in 3 young adults in U.S. is unfamiliar with the five signs of a stroke, a study warns

The sooner people call for help after stroke symptoms - sudden numbness or weakness, especially on one side; trouble speaking or confusion; sudden trouble with eyesight; sudden trouble walking or dizziness; and sudden, severe headache with no known cause - the higher the likelihood the patient will survive.

A long exposure causes the emblems on the back of the ambulance to blur en route to a call in Somerville. (Jessica Rinaldi/Globe Staff)

For years, experts have tried to hammer the message home: Call 911 at the first signs of a stroke.

But is their message getting through?

Not as well as hoped, a new study suggests: Nearly 1 in 3 young adults (mean age 31.3) in the United States is unaware of all five stroke symptoms.

The sooner people call for help after stroke symptoms – sudden numbness or weakness, especially on one side; trouble speaking or confusion; sudden trouble with eyesight; sudden trouble walking or dizziness; and sudden, severe headache with no known cause – the higher the likelihood the patient will survive.

A group of physicians from across the country analyzed data from the 2017 National Health Interview Survey, which monitors the health of the U.S. population using household interviews. The 9,844 people interviewed statistically represent about 107 million young adults nationwide. Nearly 29% of them were not aware of all stroke symptoms, and 2.7% could not name a single symptom.

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The study, published in the journal Stroke, shows associations between age, education level and ethnicity and the likelihood a young adult will know stroke symptoms. Hispanic adults were about two times as likely to be unaware of any stroke symptoms compared to non-Hispanic participants, and people with a high school education or lower were almost three times as likely. Both groups are more vulnerable to strokes than more highly educated or White adults.

The survey also asked participants if they would call 911 or contact emergency services if they saw stroke symptoms in themselves or another person. People in the lowest-income groups were less likely to say yes, and the researchers estimate that about 3 million young adults would probably not call.

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Young people’s likelihood of stroke has risen sharply in recent decades. Even as stroke incidence rates fell across the U.S. population from 2000 to 2010, the rate among young adults rose 43.8%. The study’s authors say it’s time for more focused initiatives and educational campaigns to spread the word about stroke.

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