title: [Epidemiological study on semen quality of 562 volunteers aged 22-30].
abstract: OBJECTIVE
  This study is to understand the difference of semen quality among the different areas and the related factors.
  
  
  METHODS
  Five hundred and sixty-two people were under from seven provinces.
  
  
  RESULTS
  Results showed that the quantity and density of semen, the rate of moving forward semen, livability, percent age of normal formed semen and the total number of semen were statistically different among the seven areas. The difference was ranged as 28.82%, with the highest 2.95 ml in Shanxi province and the lowest 2.29 ml in Henan province. Geometric mean of semen density was found the lowest 36.27 x 10(6)/ml in Guizhou province, next to it was 42.52 x 10(6)/ml in Shandong province and the highest was 74.77 x 10(6)/ml in Hebei province. The percent age with forward progression of semen was seen the lowest 44.40% in Henan province, followed by 51.88% in Hebei province and 52.88% in Zhejiang province and the highest were 76.50% in Shanghai, 75.24% in Shanxi province, with a range of 72.30%. The highest semen viability was 85.89% in Shanghai, while the lowest 72.35% in Henan, with a range of 18.71%. Normal sperm morphology was seen the lowest 68.45% in Hebei province, with the highest 88.06% in Guizhou province, and the range was 28.65%. The geometric mean of total sperm count was seen the highest 204.23 x 10(6)/ml in Hebei province and the lowest 77.69 x 10(6)/ml in Guizhou province. Results showed through analysis of variance that some indexes were different in some provinces.
  
  
  CONCLUSIONS
  The results indicated that the semen quality was different in different regions in China and its influential factors may be region and geography environment.
authors.affiliation: Shanghai Medcal College, Fudan University, Shanghai 200032, China.
authors.forename: Jun-qing
authors.initials: JQ
authors.lastname: Wu
authors.forename: Qiu-ying
authors.initials: QY
authors.lastname: Yang
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Tao
authors.forename: Wen-ying
authors.initials: WY
authors.lastname: Li
authors.forename: Er-sheng
authors.initials: ES
authors.lastname: Gao
authors.forename: Li-wei
authors.initials: LW
authors.lastname: Bo
authors.forename: Yu-xian
authors.initials: YX
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Guo
authors.forename: Kang-shou
authors.initials: KS
authors.lastname: Yao
authors.forename: Wei-qun
authors.initials: WQ
authors.lastname: Lu
authors.forename: Lu
authors.initials: L
authors.lastname: Chen
mesh_terms: D000328:Adult; D002681:China; D006801:Humans; D008297:Male; D012111:Residence Characteristics; D012661:Semen / Q000166:cytology / Q000502:physiology*; D012959:Socioeconomic Factors; D013076:Sperm Count; D013081:Sperm Motility; D013094:Spermatozoa / Q000502:physiology*