ASD Autism less common among asian more common among african and europeans?

CC variant of Rs1858830 seems more common among europeans, africans and less among asians. Seems also related with a slightly higher risk of autistic disorders.
Here its distribution among peoples


http://browser.1000genomes.org/Homo_sapiens/Variation/Population?r=7:116311939-116312939;v=rs1858830;vdb=variation;vf=1428840#12986_tablePanel

whats your variant? I'm CC

FYI, there are hundreds of genes associated with autism, and genetics is only one determining factors in autism (another important one is apparently one's microbiome). Besides, autism is not a unique condition, but a very wide spectrum of very different, though conditions.