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#129 86_tablePanel
whats your variant? I'm CC