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Table 4 Pearson correlations among water fluoridation prevalence and ADHD prevalence

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

Variables 2 3 4 5 6 7 8 9
1.) ADHD2003 .67 .65 .32* .37** .38** .39** .39** .32*
2) ADHD2007 .71 .35** .30* .30* .31* .28* .21
3.) ADHD2011 .39** .34** .32* .34** .33** .25*
4.) FPrev_1992 .82 .80 .81 .80 .75
5.) FPrev_2000 .96 .91 .91 .89
6.) FPrev_2002 .96 .97 .93
7.) FPrev_2004 .99 .95
8.) FPrev_2006 .96
9.) FPrev_2008
  1. Note. ADHD, parent-reported health care provider-diagnosed lifetime prevalence of ADHD in that year. FPrev_, percentage of the population receiving fluoridated water from public water systems in that year. *p < .05, **p < .01. When not corrected for family-wise error, simple Pearson r > .25 is significant at p = .05, r > .33 is significant at p = .01.