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Research on the intellectual development of children in high fluoride areas.

Distribution of intellectual ability in the endemic area and the control: The IQs of most of the 7–14 year old children from both the endemic area and the control area were in the average or above average range, but among the 320 children in the high fluoride area there were two children, or 0.60%, whose IQ was lower than 69, which classifies them as being intellectually underdeveloped. There are no children from the control group that fall into the intellectually underdeveloped range. In t