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Table 3 Prevalence of water fluoridation as a function of geographic region

From: Exposure to fluoridated water and attention deficit hyperactivity disorder prevalence among children and adolescents in the United States: an ecological association

  1992 2000 2002 2004 2006 2008
Region M SD M SD M SD M SD M SD M SD
Northeast 39.6 22.36 49.39 22.60 50.79 22.0 49.78 19.25 50.30 19.43 50.13 21.39
Midwest 69.1 11.84 69.62 9.32 72.51 10.77 73.25 10.69 72.87 10.78 70.17 13.11
South 69.0 15.11 67.80 16.17 71.68 14.74 74.82 15.11 74.37 15.85 73.37 17.51
West 31.7 22.78 34.13 20.70 37.26 20.86 39.90 19.5 41.16 19.35 43.65 19.78
  1. Note. M, mean percentage of population receiving fluoridated water from public water systems in that year. SD, standard deviation. Northeast, n = 9, Midwest, n = 12, South, n = 17, West, n = 13.