Table 1.

Allele Frequency Distribution of SNPs

SNP	Current data	Previously reported data
Total number	26,530	502
Uncommon	1,342 (5.1%)	30 (6.0%)
Common ≥1 population	21,101 (79.5%)	385 (76.7%)
Common ≥2 populations	15,029 (56.6%)	263 (52.4%)
Common in all 3 populations	7,908 (29.8%)	135 (27.0%)

A common SNP is defined in which the minor allele frequency is ≥20%. This frequency threshold was used so that the current data could be compared with previously reported estimates of allele frequency (Marth et al. 2001).