This is a family-based, cross-sectional study in the isolated Scottish archipelago of Orkney. Genetic diversity in this population is decreased compared to mainland Scotland (McQuillan et al. 2008). Data from 445 healthy volunteers (57% female) from a subgroup of 10 islands, aged 18–84 years (mean=54.9±13.8) with known Orcadian ancestry, were available. Personality assessments were collected during 2005–2007.
