In an analysis of 19 studies, Chinese researchers found that people with a prehypertensive reading of 120-139/80-89 mm Hg were 66% more likely to suffer a stroke than those with normal blood pressure level. The risk of hypertension was 44% higher among those with low-range prehypertension and 95% greater among high-range prehypertensive patients. The findings appear in the journal Neurology.

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