We also examined haplotypes consisting of the four externalizing-associated SNPs (Table 1 SNPs 1–4). We found that the haplotype formed by the four SNPs was more significantly associated with externalizing than any individual SNP (β= −0.5063 and p=0.00025 for the GGAA haplotype). This haplotype was not associated with PTSD (p=0.60).
