Table 2. .
Measures of Population Stratification for Skin-Reflectance Pools of Different Compositions
| No. of SNPs with Small P Values in χ2 Tests for Associationb |
|||||||
| Pooling Strategy | L/Ha | P<.0001 | P<.001 | P<.01 | P<0.1 | χ2 Sum | Overall P |
| Expectedc | 395/383 | 0 | 0 | 3 | 29 | 294 | … |
| All of cohort 1 included | 395/383 | 5 | 9 | 24 | 86 | 740 | 2.9×10−40 |
| Matched by inferred ancestryd | 286/285 | 1 | 2 | 8 | 43 | 400 | 3.9×10−5 |
a
Number of individuals included in each of the skin-reflectance phenotypic pools.
b
χ2 tests for association were based on 294 GC SNPs.
c
The expected number of SNPs with low P values, based on the null hypothesis of no population structure in cohort 1.
d
Inferred ancestry values were obtained from the structure program, with the two-cluster model.