Of course it should, but the point of the statistic is that- what is more important to concentrate on because you have a more liklihood of coming down with it.
“Knowing the cause helps in preventative measures”
That is exactly the point -there are many causes. You are clouding the issue by blaming only one cause which you claim others have insisted is the main cause.
And my point was -a person shouldn’t concentrate on just not having the in-laws or parents mingling, noone should get involved in people’s marriages, unless they are professionals. They can cause irreversible damage!