title: [Spatial and age distribution of spermarche and its influence on development of male adolescents in China].
abstract: Spatial and age distribution of spermarche, and difference of growth and development in pre- and post-spermarcheal boys were analyzed based on the data of national physique and health surveillance for school children collected in 1991 to study the relationship between spermarche and development. Generally, there existed a trend that onset of spermarche was earlier in boys living in south China than in the north, and earlier in urban than in rural areas. Physique, physiological quality and sports performance were significantly better in post-spermarcheal boys aged 11 to 14 than in pre-spermarcheal ones. Discriminant analysis showed there were significant differences in development between pre- and post-spermercheal boys, especially in body height, weight, biacromial diameter, biiliocristal diameter and vital capacity, but there was no difference in type of body build.
authors.affiliation: Institute of Child and Adolescent Health, Beijing Medical University.
authors.forename: C
authors.initials: C
authors.lastname: Ji
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002657:Child Development; D002681:China; D004542:Ejaculation; D006801:Humans; D008297:Male; D011627:Puberty; D012423:Rural Health; D012741:Sexual Maturation; D014504:Urban Health