[Newsweek] claims a study shows a link between ADHD and fluoridated water.
New research shows there is a strong correlation between water fluoridation and the prevalence of Attention Deficit Hyperactivity Disorder, or ADHD, in the United States.
The [study], published in Environmental Health, concludes:
State prevalence of artificial water fluoridation in 1992 significantly positively predicted state prevalence of ADHD in 2003, 2007 and 2011, even after controlling for socioeconomic status. A multivariate regression analysis showed that after socioeconomic status was controlled each 1% increase in artificial fluoridation prevalence in 1992 was associated with approximately 67,000 to 131,000 additional ADHD diagnoses from 2003 to 2011. Overall state water fluoridation prevalence (not distinguishing between fluoridation types) was also significantly positively correlated with state prevalence of ADHD for all but one year examined.
Dr Peyet, a dentist, [claims] this is simply a correlation, which does not prove causation, and that the science is bad.
Dr Ken Perrott, a scientific blogger at [Open Parachute] claims this is an example of poor quality peer-review:
This is one example of peer-review and paper acceptance which brings into question the idea of using publication and peer-review as endorsement of a study’s quality.
My question is, who's right?