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The chinese evidence at a glance

MagazineNovember 2002 (Vol. 13 Issue 8)The chinese evidence at a glance

In the Chinese study of 907 children from four areas in Guizhou Province, the degree of exposure to fluoride was clearly linked to IQ test scores:

In the Chinese study of 907 children from four areas in Guizhou Province, the degree of exposure to fluoride was clearly linked to IQ test scores:

Type of area Fluoride concentration Number of children Mean IQ

Non-fluorosis < 0.4 ppm 220 99.4 +/- 10.4

Slight fluorosis 0.8 ppm 227 89.7 +/- 2.7

Medium fluorosis 2.5 ppm 224 79.7 +/- 12.7

Severe fluorosis 3.2 ppm 230 80.3 +/- 12.9


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