About 3,000 women develop the condition each year.
Research has only begun to confirm why some women develop the condition.
Men are also more likely to develop the condition than women.
With an ageing population, the cost of supporting people with dementia is increasing as more people develop the condition.
About a third of children with two or more autistic older siblings also will develop the condition.
Stuttering affects 1% of the adult population, though 5% of children about the age of five develop the condition, with most growing out of it after childhood.
Surprisingly, those who said they felt under only moderate pressure were at highest risk of all, being 60% more likely to develop the condition.
Nearly five million Americans live with varying degrees of heart failure, and more than a half-million develop the condition each year.
The patient whose case was the centerpiece of the kidney study said he was most likely predisposed to develop the condition.
For some conditions, like Huntington's disease, genetic determinism is simply correct: everyone with the defective gene who lives long enough will develop the condition.
Some sufferers find their symptoms decrease or disappear as they reach their twenties, but some adults develop the condition in their thirties or in middle age.
