Somewhere from 1 in 1000 to 1 in 500. This number is far from exact because not everyone with Klinefelter's is diagnosed.
that number is usually the age world round to where you can get your drivers license but that's all i can think of.
Approximately 500 - 600 people in the word have Joubert Syndrome.
Medscape Reference reports that Werner syndrome has no racial predilection. However it also says that Werner is syndrome is much more common in Japan and Sardinia. (There are about 1000 cases in the world, 800 of them are in Japan) I believe they are referencing the location having more cases as opposed to the Japanese people being more affected.
1 in every 5,00o to 7,000 people have Marfan syndrome.
Yes. Marfan syndrome is found equally in all ethnic groups.
1993 a woman (i'm not sure on her name) preformed a study on savants (there is a documentary following her travels with savants) and was able to contact about 50 (i do not know wheather or not they were of the autistic variety)
1000
3500
0.144%
In this, I believe that the girls that stay alone are usually have such social differences such as Asperger's syndrome. Many of the great men of the world had this. They are not weird but are probably not wanting the idea of losing many friends. I agree with them. I have Asperger's syndrome myself.
that's unanswerable
There are approximately7,222,222 people with down syndrome in the world ( if you compare the stat 1 in every 800-1000 births to the world's population of 6.5 billion).