I think we need more data than that before we draw any conclusions. That's a rather small sample size. This reminds me of an excerpt from The Sports Gene about

I think we need more data than that before we draw any conclusions. That's a rather small sample size. This reminds me of an excerpt from The Sports Gene about Met and Val alleles in the COMT[1] gene, though: "Cognitive testing and brain imaging studies have found that subjects with two Met versions - both animals and humans - tend to do better and require less metabolic effort for cognitive and memory tasks, but that they are also more prone to anxiety and more sensitive to pain. Conversely, Val/Val carriers seem to do slightly worse on cognitive tests that require rapid mental flexibility, but may be more resilient to stress and pain." [1]: http://www.ncbi.nlm.nih.gov/pubmed/22530780 http://www.ncbi.nlm.nih.gov/pubmed/22530780