Proportion of associations reported as significant () using different methods of stratification correction for simulated data.

aStruInfo SNPs: Allele frequencies were simulated based on the Balding-Nichols model and the SNPs were population structure informative. bSpecific SNPs: Allele frequencies of the populations were fixed to the specified values: (proportional to the ratio of the sample sizes) or (inversely proportional to the ratio of the sample sizes). cCausal: Genotypes were generated according to the proportion: where is the causal allele frequency and is the relative risk. dNull: Genotypes were generated according to the Hardy-Weinberg proportion: . SNPs were simulated for each of the categories.