Community Water Fluoridation and Intelligence: Prospective Study in New Zealand.

Published

Journal Article

Objectives. This study aimed to clarify the relationship between community water fluoridation (CWF) and IQ. Methods. We conducted a prospective study of a general population sample of those born in Dunedin, New Zealand, between April 1, 1972, and March 30, 1973 (95.4% retention of cohort after 38 years of prospective follow-up). Residence in a CWF area, use of fluoride dentifrice and intake of 0.5-milligram fluoride tablets were assessed in early life (prior to age 5 years); we assessed IQ repeatedly between ages 7 to 13 years and at age 38 years. Results. No clear differences in IQ because of fluoride exposure were noted. These findings held after adjusting for potential confounding variables, including sex, socioeconomic status, breastfeeding, and birth weight (as well as educational attainment for adult IQ outcomes). Conclusions. These findings do not support the assertion that fluoride in the context of CWF programs is neurotoxic. Associations between very high fluoride exposure and low IQ reported in previous studies may have been affected by confounding, particularly by urban or rural status.

Full Text

Duke Authors

Cited Authors

  • Broadbent, JM; Thomson, WM; Ramrakha, S; Moffitt, TE; Zeng, J; Foster Page, LA; Poulton, R

Published Date

  • January 2015

Published In

Volume / Issue

  • 105 / 1

Start / End Page

  • 72 - 76

PubMed ID

  • 24832151

Pubmed Central ID

  • 24832151

Electronic International Standard Serial Number (EISSN)

  • 1541-0048

International Standard Serial Number (ISSN)

  • 0090-0036

Digital Object Identifier (DOI)

  • 10.2105/ajph.2013.301857

Language

  • eng