This is found in high frequency male athletes from power sports such as jumpers, throwers, and sprinters. [PMID 19701646]
Mexicans with this SNP, and also a T at rs1800783, have lower LDL cholesterol.
Notably, this SNP does not change the amino acid (it is in the promoter region and doesn't encode the protein's amino acid sequence). The population frequencies in HapMap are incorrect.