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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.