The two regions in which the cohorts lived differed in geography, population size, and character. Comparative analysis showed that the magnitude of the relationship between intelligence and criminality is relatively unaffected by differences in population size, density, and homogeneity. Young boys who scored poorly on intelligence tests and lived in quiet communities were as likely as their Stockholm urban counterparts to develop criminal behavior. The paper concludes that the factors which influence intelligence related to criminal behavior in an urban center also operate in a smaller community. 6 tables, 2 notes, 30 references. (Author abstract modified)