The SardiNIA study includes 6 148 related individuals from four towns in the Ogliastra province of Sardinia, Italy.21 These individuals represent 62% of the population in these towns. Valid NEO-PI-R1 personality data were available for 5 669 individuals, of which 3 972 were genotyped (56.7% women). The mean age of all participants was 42.8 years (SD=17). The mean age of the men was 43.0 years (SD=18), and of the women 42.4 years (SD=17). The sample has been described in more detail by Terracciano and coauthors.31
