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 The facts behind “1 in 6” 

The theme of the 2010 campaign is "1 in 6". The reason behind this is to emphasize how widespread stroke is. Not many people are aware of this fact. One in six people in the world will suffer a stroke in their lifetime; on this page, you will find the data and references behind that statistic and others.

The lifetime risk of stroke is 1 in 5 for women, 1 in 6 for men:

Sources

Seshadri S., Wolf P.A. (2007). Lifetime risk of stroke and dementia: current concepts, and estimates from the Framingham Study. The Lancet Neurology 6(12), 1106-14. Link

Seshadri S. et al. (2006). The lifetime risk of stroke: estimates from the Framingham Study. Stroke 37, 45-350. Link

Participants (n=4897) who were stroke- and dementia-free at 55 years of age were followed biennially for up to 51 years. ... A total of 875 participants (522 women) developed a first-ever stroke; 749 (448 women) had an ischemic stroke. LTR of stroke was high and remained similar at ages 55, 65, and 75 years, approximating 1 in 5 for women and 1 in 6 for men. Participants with a normal BP (<120/80 mm Hg) had approximately half the LTR of stroke compared with those with high BP (≥140/90 mm Hg)
We observed that the LTR of stroke for middle-aged and "young-old" adults (55 to 75 years of age) was substantial at 1 in 6 or higher. This risk was higher in women (1 in 5) compared with men, largely because of the greater life expectancy in women, which increased their period at risk.

Bushnell, C.D. (2008). Stroke and the female brain. Nature Clinical Practice Neurology 4(1), 22-33. Link

Stroke is the third leading cause of death in most countries, and is one of the leading causes of long-term disability. Women have a higher lifetime risk of stroke than men (1 in 5 vs 1 in 6), a statistic that is influenced in part by the longer life expectancy in women. The female population not only carries a higher burden of stroke during their lifespan - women also account for the majority of stroke deaths.

Every two seconds, someone in the world suffers a stroke
Every six seconds, someone dies of a stroke
Every six seconds, someone’s quality of life will forever be changed – they will permanently be physically disabled due to stroke

Source

World Health Organization (2004). Atlas of Heart Disease and Stroke.

Annually, 15 million people worldwide suffer a stroke.