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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.