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The Relationship of a Low-Iodine and High-Fluoride Environment to Subclinical Cretinism in Xinjiang

Lin Fa-Fu, Aihaiti, Zhao Hong-Xin, Lin Jin, Jiang Ji-Yong, Maimaiti, and Aiken.

Iodine Deficiency Disorder Newsletter 1991 August Vol. 7 No. 3

 

"We studied a total of 769 schoolchildren of 7-14 years in three areas, characterized by intakes of (A) low iodine, high fluoride; (B) low iodine, normal fluoride; and (C) iodine supplemented, normal fluoride. Results for the following parameters for areas A, B, and C, respectively were: (a) average IQ: 71, 77, 96; (b) average auditory threshold (in dB): 24, 20, 16; (c) bone age retardation (%): 28, 13, 4; (d) thyroid 131I uptake (%): 60, 50, 24; and (e) serum TSH (mU/ml): 21, 11, 6. Statistically significant differences existed between these areas, suggesting that a low iodine intake coupled with high fluoride intake exacerbates the central nervous lesions and the somatic developmental disturbance of iodine deficiency. The detection rate of subclinical endemic cretinism in children with mental retardation was 69%, and the total attack rate of subclinical endemic cretinism 9%."
 

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