TABLE 1—

Mean Weschler IQ Scores in Childhood and Adulthood by Sources of Fluoride Exposure: Dunedin Multidisciplinary Health and Development Study; Dunedin, New Zealand; 1972–2012

	IQ at Age 7–13 Years			IQ at Age 38 Years
Variable	Mean (SD)	No.	P	Mean (SD)	No.	P
Area of residence (age 5 y)			.92			.18
CWF area	100.0 (15.1)	891		100.2 (15.1)	847
Never lived in CWF area	99.8 (14.5)	99		98.1 (14.4)	93
Unknown		2			2
Fluoride toothpaste (age 5 y)			.32			.51
Always	100.2 (14.9)	634		100.0 (15.0)	608
Sometimes	98.7 (13.8)	240		98.8 (15.1)	217
Never	100.2 (20.5)	22		101.1 (11.5)	20
Unknown		96			97
Fluoride tablets (age 5 y)			.71			.83
Ever used	100.2 (15.0)	139		100.0 (15.4)	136
Never used	99.7 (14.7)	763		99.7 (14.8)	715
Unknown		90			91
IQ known	100.0 (15.0)	992		100.0 (15.0)	942

Note. CWF = community water fluoridation. At age 13 years, 1032 study members were living; at age 38 years, 1007 study members were living.