title: [Study on level of dietary iodine intake and its contribution rate of residents in Zhejiang].
abstract: OBJECTIVE
  To assess the level of dietary iodine intake and its contribution in Zhejiang.
  
  
  METHODS
  A total of 9798 subjects were recruited in this survey with multi-stage stratified cluster random sampling method in April, 2010, the 24-hours dietary recall method and the "food composition table" were used to obtain the dietary iodine intake, and edible salt and drinking water samples were collected to detect the content of iodine.
  
  
  RESULTS
  A total of 9798 subjects were included in this survey. The mean intake of dietary iodine in Zhejiang residents per standard man-days was (395.13 ± 78.16) µg/d, which in between of Recommended Nutrient Intake (RNI) 150 µg/d and Tolerable Upper Intake Level (UL) 1000 µg/d; the iodine intake of 18.40% (1803/9798) subjects was lower than estimated average requirement of iodine (EAR), 4.68% (459/9798) subjects was higher than the UL. The means of dietary iodine intake in various areas were (498.85 ± 96.77) µg/d, (384.50 ± 88.76) µg/d and (326.33 ± 78.32)µg/d in inland areas, sub-coastal areas and coastal areas, successively (F = 27.17, P < 0.05); the proportions of dietary iodine intake lower than EAR were 34.89% (1239/3551), 10.48% (370/3530) and 7.14% (197/2717) in coastal areas, sub-coastal area and inland areas, successively (χ(2) = 62.87, P < 0.01) , while those higher than UL were 5.10% (180/3530), 4.86% (132/2717) and 4.14% (147/3551) in sub-coastal area, inland areas and coastal areas.In the condition of ignoring cooking loss, the mean contribution of dietary iodine intake in edible salt, all kinds of food and drinking water were 74.92% (296.03/395.13), 23.85% (94.24/395.13) and 1.23% (4.86/395.13), successively; the contributions of edible salt in inland areas, sub-coastal areas and coastal areas were 83.72% (417.64/498.85), 73.05% (280.88/384.50) and 66.83% (280.09/326.33), successively; the contributions of drinking water in sub-coastal areas, coastal areas and inland areas were 1.61% (6.19/384.50) , 1.44% (4.70/326.33) and 0.65% (3.24/498.85) , successively (χ(2) = 7.24, P = 0.032) ; the contribution of laver in coastal areas, sub-coastal areas and inland areas were 22.57% (73.65/326.33), 17.11% (65.79/384.50) and 8.09% (40.36/498.85), successively (χ(2) = 82.17, P < 0.01) ; the contribution of sea fish in coastal areas, sub-coastal areas and inland areas were 2.38% (7.77/326.33), 0.72% (2.77/384.50) and 0.68% (3.39/498.85) (χ(2) = 19.47, P = 0.012).
  
  
  CONCLUSIONS
  The dietary iodine intake of Zhejiang residents was at recommended intake levels; the iodized salt turns out to be the main source, the iodine nutrition level was relatively low in coastal areas of Zhejiang, which the coverage of iodized salt should be improved.
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China. Email:gmmao@cdc.zj.cn.
authors: Guang-ming
authors: GM
authors: Mao
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Gang-qiang
authors: GQ
authors: Ding
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Li-chun
authors: LC
authors: Huang
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Xiao-ming
authors: XM
authors: Lou
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Rong-hua
authors: RH
authors: Zhang
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Wen-ming
authors: WM
authors: Zhu
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Xiao-feng
authors: XF
authors: Wang
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Zhe
authors: Z
authors: Mo
authors: Department of Environment and Occupation Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China.
authors: Jin-shui
authors: JS
authors: Zhou
mesh_terms: D002681:China; D004034:Diet Surveys; D060766:Drinking Water; D005260:Female; D006801:Humans; D007455:Iodine / Q000032:analysis*; D008297:Male; D009752:Nutritional Status; D012424:Rural Population; D017673:Sodium Chloride, Dietary / Q000032:analysis*; D014505:Urban Population
chemical_list: D060766:Drinking Water; D017673:Sodium Chloride, Dietary; C034024:iodized salt; D007455:Iodine