To address studies that indicate an inverse relationship between intelligence and mortality rates, Batty and colleagues capitalized on a large cohort of Swedish men who, upon entry into military service in Sweden were subjected to an assessment of intelligence quotient (IQ) by comprehensive examination of cognitive function.Source:
Batty GD, et al. IQ in early adulthood and later cancer risk: cohort study of one million Swedish men. Ann Oncology. 2007;18:21-28.