Regional and ethnic differences in semen quality and reproductive hormones in Russia: A Siberian population‐based cohort study of young men

This is the first large-scale Russian study describing semen quality and reproductive hormone levels among young men.The aim of the study was to compare semen quality and reproductive hormone levels in young men of four cities and three ethnic groups living in the Siberian region of Russia and to find out ethnic or environmental reasons for regional differences.The study population consisted of 1291 young men from Novosibirsk, Kemerovo,...