Bonferroni cutoff of 2e−7, 28 autosomal markers were associated with participant sex (p<2e−7) and 793 SNPs had two or more errors of any of these kinds: incorrect call in a CEPH sample, discordant calls in a pair of duplicated samples or an MZ twin pair, Mendelian inconsistency, heterozygosity for an X-chromosome marker in a male sample, or nonmissing Y-chromosome genotype for a female sample.