title: [A study on the variation of goiter rates, urinary iodine and household salt iodine intake among children in West China].
abstract: OBJECTIVE
  To study the factors leading to the variation of children's total goiter rates, urine iodine and salt iodine in West China.
  
  
  METHODS
  Design effect (DEFF) was used to evaluate the variation of indicators.
  
  
  RESULTS
  DEFF of children's total goiter rate was about 3.0 in 9 provinces, and the proportion was 75.0%. The DEFF of urine iodine was 1.0 - 3.5 in 6 provinces, and the proportion was 50.0%. The DEFF of intake rate of qualified iodized salt was over 3.0 in 11 provinces. The DEFF of covering rate of iodized salt was about 3.0 in 4 provinces.
  
  
  CONCLUSIONS
  In order to provide scientific basis for IDD surveillance in China, other than bias due to methods of no-sampling, sample size should be further calculated in West China. Thus the main influencing factors of indicator variation could be measured with scientific and reasonable basis.
authors.affiliation: Institute for Iodine Deficiency Disorders Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin 150086, China.
authors.forename: Xiao-hui
authors.initials: XH
authors.lastname: Su
authors.forename: Shou-jun
authors.initials: SJ
authors.lastname: Liu
authors.forename: Shu-qiu
authors.initials: SQ
authors.lastname: Sun
authors.forename: Yong-xiang
authors.initials: YX
authors.lastname: Ye
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
mesh_terms: D002648:Child; D002681:China / Q000453:epidemiology; D006042:Goiter / Q000453:epidemiology*; D006801:Humans; D007455:Iodine / Q000008:administration & dosage* / Q000652:urine*; D018401:Sample Size; D017673:Sodium Chloride, Dietary / Q000008:administration & dosage*
chemical_list: D017673:Sodium Chloride, Dietary; C034024:iodized salt; D007455:Iodine