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(CNN) - A third of all stroke victims don't call an ambulance to get them to the hospital, leaving them vulnerable to delayed treatment and worse outcomes.
That's according to a new study published in the journal Circulation.
The authors analyzed data on more than 200,000 patients seen at more than 1,500 U.S. hospitals over seven years.
Patients who arrived by ambulance were about twice as likely to arrive at a hospital quickly.
They were about 50 percent more likely to receive a clot-busting drug within the recommended three-hour window, when it's most effective.
The study also found younger stroke patients and ethnic minorities are less likely than others to call an ambulance.
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Study: A third of stroke victims don't call an ambulance