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目的了解碘盐含量调整对8~10岁学生碘营养状况的影响,为制定合理的碘盐含量标准和确定采样时间提供依据。方法在安徽省水碘含量低于10μg/L的金寨县和来安县各选择1个乡镇,在每个乡镇随机整群抽取1所小学8~10岁学生并在新标准碘盐置换前(基线)和置换后的1,2,3,6,9,12个月分别开展7次8~10岁学生家庭食用盐调查和学生尿碘水平调查。结果基线调查和碘盐浓度调整后的第1~6次评估调查中,学生家庭碘盐中位数分别为29.9,27.6,24.2,23.3,23.4,24.0和22.8 mg/kg,学生尿碘浓度中位数分别为316.5,361.3,297.7,315.8,303.9,277.1和219.1μg/L。两地8~10岁儿童基线尿碘浓度和最后1次评估尿碘浓度差异均有统计学意义(Z值分别为3.78,8.87,P值均<0.01)。结论食用新标准碘盐后,安徽省8~10岁学生尿碘水平从过量下降到超出适宜水平。
Objective To understand the effect of iodized salt content adjustment on iodine nutrition status of students aged 8 ~ 10 years, and to provide basis for establishing reasonable iodine salt content standard and determining sampling time. Methods We selected 1 township in Jinzhai County and Lai’an County with less than 10μg / L of iodine in Anhui Province, and randomly selected a group of 8-10-year-old students from each township to study the effects of iodine salt replacement Baseline) and 1, 2, 3, 6, 9 and 12 months after the replacement respectively. Seven household salt surveys of students aged 8-10 years and urine iodine levels of students were conducted. Results In the first to sixth assessment surveys after adjustment of baseline and iodized salt concentration, the median of iodized salt in the family was 29.9, 27.6, 24.2, 23.3, 23.4, 24.0 and 22.8 mg / kg, respectively Digits were 316.5, 361.3, 297.7, 315.8, 303.9, 277.1 and 219.1 μg / L, respectively. There were significant differences in the baseline urinary iodine concentration and the urinary iodine concentration in the final assessment of children aged 8-10 years (Z = 3.78 and 8.87, P <0.01 respectively). Conclusion After using the new standard iodized salt, urinary iodine levels of students aged 8 to 10 in Anhui Province dropped from overdose to beyond the appropriate level.