Popławska, Helena; Wilczewski, Adam; Dmitruk, Agnieszka; … - In: Economics & Human Biology 11 (2013) 2, pp. 221-226
The aim of this study was to determine secular changes in the sexual maturation of children and adolescents from Eastern regions of Poland between 1980 and 2000, with special attention paid to rural–urban differences. Our sample comprised 34,055 girls and 28,100 boys from 9 to 18 years of age....