title: [Survey of vitamin D status in 700 healthy adult males in Guiyang, China].
abstract: OBJECTIVE
  To evaluate the vitamin D status of healthy adult males living in Guiyang.
  
  
  METHODS
  A total of 700 healthy volunteers aged 20 - 79 years were selected randomly from a community in Guiyang by stratified sampling method. Questionnaires for living habits and fasting blood samples were collected in the morning from November 2009 to January 2010. The serum concentrations of 25-hydroxyvitamin D were measured by the DiaSorin radioimmunoassay kit.
  
  
  RESULTS
  The mean levels of serum 25(OH)D was (21 ± 10) µg/L. And the percentages of vitamin D deficiency (25(OH)D < 20 µg/L), insufficiency (20 µg/L ≤ 25(OH)D < 30 µg/L) and sufficiency (25(OH)D ≥ 30.0 µg/L) were 315(50.2%), 202 (32.2%) and 110(17.6%)respectively. The concentrations of serum 25(OH)D in young, middle-aged and old adults were (18 ± 10) µg/L, (24 ± 10) µg/L and (22 ± 8)µg/L respectively. The serum level of 25(OH)D was lower in the smokers than that in the non-smokers (20 µg/L vs 22 µg/L, P = 0.003). The serum concentrations of 25(OH)D were (24 ± 10) µg/L, (23 ± 10) µg/L, (22 ± 9) µg/L and (18 ± 9) µg/L in education level (≤ 6, 7 - 9, 10 - 12 and ≥ 10 years in school) respectively. Significant inverse correlations existed between the concentrations of serum 25(OH)D and the education levels (r = -0.138, P = 0.000).
  
  
  CONCLUSIONS
  The prevalence of hypovitaminosis D is common in healthy adult males in Guiyang, especially among the youth, smokers and higher educated groups.
authors.affiliation: Department of Endocrinology & Metabolism, Guiyang Medical College, Guiyang, China. zhangqiao@medmail.com.cn
authors.forename: Qiao
authors.initials: Q
authors.lastname: Zhang
authors.forename: Li-xin
authors.initials: LX
authors.lastname: Shi
authors.forename: Nian-chun
authors.initials: NC
authors.lastname: Peng
authors.forename: Hui-jun
authors.initials: HJ
authors.lastname: Zhuang
authors.forename: Dan-rong
authors.initials: DR
authors.lastname: Wu
authors.forename: Jing-lu
authors.initials: JL
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D002681:China / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood; D014808:Vitamin D Deficiency / Q000453:epidemiology*; D055815:Young Adult
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D