| | 1 STR region | 2 STR regions | 3 STR regions |
|---|
| | Di | Tri | Tetra | Di | Tri | Tetra | Tetra |
|---|
Number of loci | 12 |
73
|
201
| 7 | 12 | 55 | 4 |
γ1 < 0 | -0.105 |
-0.333
|
-0.291
| -0.286 | -0.252 | -0.124 | - |
Number of loci | 18 |
60
| 124 | 3 | 3 | 42 | 8 |
γ1 > 0 | -0.007 |
-0.545
| -0.043 | - | - | -0.225 | -0.143 |
- Spearman's rank correlation coefficients (ρ) are shown for comparisons of microsatellite heterozygosity with skewness in the distribution of the number of repeats across individuals in the HGDP-CEPH data set. Microsatellites were classified by the number of separate STR regions embedded in their sequence, by their repeat unit size, and based on whether skewness (γ1) was greater or less than zero. Hyphens indicate comparisons that were not evaluated. For three STR regions, no comparisons were performed for di-nucleotide and tri-nucleotide loci because of small sample size (3 and 2, respectively). Correlations with P < 0.05 are highlighted in bold.