title: [Repeated cross-sectional studies on urinary iodine and iodine content of salt among school-aged children from 2012 to 2014 in Yuhuan County, Zhejiang Province].
abstract: OBJECTIVE
  To investigate the iodine status and its change among school-aged children in their morning urine and eating salt from 2012 to 2014 in Yuhuan County, Zhejiang Province, China.
  
  
  METHODS
  Three repeated cross-sectional studies were carried out at a same primary school in 2012, 2013 and 2014, respectively. Three classes were randomly selected from each of 3 to 5 grade by the cluster-stratified sampling every year. Totally, 1343 out of 1350 eligible children aged 8 to 10 years old were involved into this study. Their morning urine and salt eating at home were collected and tested.
  
  
  RESULTS
  The overall median of urine iodine was 116.0 μg/L, and no significant change was found over year. The overall proportions of subjects with urine iodine < 50 μg/L, < 100 μg/L, and ≥ 300 μg/L were 4.8%, 38.6% and 3.5%, respectively, and there were little differences over year, gender and grade of children. An overall median of iodine from 1343 salt samples was 0.0 mg/kg and no year difference was statistically observed. The proportions of subjects consumed iodized salt significantly decreased from 25.1% in 2012 to 21.8% in 2013 and to 14.2% in 2014. There was a significant difference in urine iodine between subjects taken iodized salt or not and also a weak positive correlation between salt iodine and urine iodine.
  
  
  CONCLUSIONS
  The nutritional status of iodine is overall stable, proper and safety in recent 3 years among school children in Yuhuan County. The coverage rate of iodized salt is very low.
authors.forename: Meifang
authors.initials: M
authors.lastname: Su
authors.forename: Congyun
authors.initials: C
authors.lastname: Wang
authors.forename: Songtao
authors.initials: S
authors.lastname: Li
authors.forename: Xuhua
authors.initials: X
authors.lastname: Ying
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhao
authors.forename: Chaowei
authors.initials: C
authors.lastname: Fu
authors.forename: Qingwu
authors.initials: Q
authors.lastname: Jiang
mesh_terms: D002648:Child; D002681:China; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007454:Iodides / Q000032:analysis* / Q000652:urine*; D007455:Iodine / Q000008:administration & dosage / Q000032:analysis / Q000652:urine*; D008297:Male; D009752:Nutritional Status; D012424:Rural Population; D012574:Schools; D017673:Sodium Chloride, Dietary / Q000008:administration & dosage / Q000032:analysis*; D013334:Students
chemical_list: D007454:Iodides; D017673:Sodium Chloride, Dietary; C034024:iodized salt; D007455:Iodine