We tested for a correlation between personality traits and an index of inbreeding in individuals' ancestry – i.e. the proportion of the genome in runs of homozygosity (Table 4). Descriptives of the number of runs and the total proportion of the genome in homozygous runs for the overall sample and each subsample are shown in Supplementary Table 7. As shown in Table 4, proportion of genome in runs of homozygosity correlated significantly and positively with Harm Avoidance, and significantly and negatively with Novelty Seeking and Reward Dependence. The alternative inbreeding coefficient based on uniting gametes (F^III) (Yang et al. 2011b) gave very similar results, the only difference being that Persistence was also significantly correlated with inbreeding (negatively, p=.02, see Supplementary Table 8). Multiple regression (data not shown) indicated the significant effects were at least partly unique to each trait, rather than a result of their intercorrelation. Furthermore, results were almost identical whether or not inbreeding coefficients were winsorised (i.e. extreme values set at 3 standard deviations from the mean; see Supplementary Table 8), suggesting that the results are not driven
