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Table 5 Hierarchical regression predicting 2003 ADHD prevalence with 1992 artificial and natural fluoridation prevalence

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

Variables

Total R 2

∆ R 2

F change

df

B

Step 1

.21

.21

13.11**

1, 49

 

ArtF_1992

    

.027**

Step 2

.24

.03

1.75

1, 48

 

ArtF_1992

    

.024**

NatF_1992

    

-.043

Step 3

     

ArtF_1992

.34

.10

6.87*

1, 47

.017*

NatF_1992

    

-.071*

SES_1992

    

-.010**

  1. Note. ArtF, prevalence of artificial water fluoridation. NatF, Prevalence of natural water fluoridation.
  2. SES, median household income. B, unstandardized coefficient.
  3. *p < .05, **p ≤ .01.
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Environmental Health

ISSN: 1476-069X