News Video | Policy | GPs | Hospitals | Medical | Mental Health | Welfare | Search

 


Dunedin IQ-fluoride study Sloppy Science

Media Release

Fluoride Free New Zealand
(Fluoride Action Network NZ Inc)

20th May 2014


Dunedin IQ-fluoride study Sloppy Science

Not only were there too few unfluoridated children in this study to give reliable results (99), it is likely that they were a large proportion of the 139 children who took fluoride tablets. If so, there is no ‘unfluoridated’ group. Why was this not disclosed?

But worse, the study fails to allow for a whole range of confounding factors. The most important period for IQ damage is in the womb, yet the mothers’ fluoride intake and other factors like iodine deficiency were not controlled for. Similarly, there was poor information on total fluoride intake by these infants. Had the study actually been prospective as claimed, rather than retrospective, this essential information could have been available.

The Dunedin research report begins with the conclusion it set out to “prove” - that fluoridation is harmless. The first two named ‘researchers’ are two of NZ’s leading political promoters of fluoridation. They are dentists, not developmental neurotoxicologists.

In contrast, a Harvard University meta-analysis of studies was conducted by some of the world’s leading expert researchers into developmental neurotoxicology, who have no known bias on fluoridation policy. There were 27 studies reviewed. The total number now available is 43. The Dunedin authors wrongly dismiss this as a single study.

The Harvard review rightly caused concern to decision-makers as it showed a consistent lowering of IQ associated with fluoride intake. It is clearly the reason this Dunedin study has been published – as a political posturing, just as the tobacco companies funded and published ‘research’ showing cigarette smoking did not cause lung cancer.

The Dunedin IQ-fluoride study is missing just about all the confounding factors that the authors have criticised in the studies reviewed by the Harvard team. This is outright sloppy science. Broadbent criticizes the studies reviewed by Harvard for not controlling for these factors (when in fact some of them did) and then fails to control for them when the data is readily available to him.

This is a single ‘study’ by politically driven dentists against a robust analysis of 27 studies by world-leading experts in this field, from one of the world’s foremost universities. You’d have to have a pretty low IQ to not know whose opinion carries the more credible weight.

--

Harvard:
http://www.hsph.harvard.edu/news/features/fluoride-childrens-health-grandjean-choi/

July 25, 2012 — For years health experts have been unable to agree on whether fluoride in the drinking water may be toxic to the developing human brain. Extremely high levels of fluoride are known to cause neurotoxicity in adults, and negative impacts on memory and learning have been reported in rodent studies, but little is known about the substance’s impact on children’s neurodevelopment. In a meta-analysis, researchers from Harvard School of Public Health (HSPH) and China Medical University in Shenyang for the first time combined 27 studies and found strong indications that fluoride may adversely affect cognitive development in children. Based on the findings, the authors say that this risk should not be ignored, and that more research on fluoride’s impact on the developing brain is warranted.

© Scoop Media

 
 
 
 
 
Culture Headlines | Health Headlines | Education Headlines

 
Sheep: Shearing Record Smashed In Hawke’s Bay

Three shearers gathered from around New Zealand have smashed a World record by 264 sheep despite the heat, the pumiced sheep of inland Hawke’s Bay and a year’s wool weighing an average of over 3.5kg a sheep. More>>

ALSO:

Carrie Fisher: Hollywood In-Breeding & The Velocity Of Being - Binoy Kampmark

There was always going to be a good deal of thick drama around Carrie Fisher, by her own confession, a product of Hollywood in-breeding. Her parents, Debbie Reynolds and the crooner Eddie Fisher, provided ample material for the gossip columns in a marriage breakup after Eddie sped away with Elizabeth Taylor. More>>

  • Image: Tracey Nearmy / EPA
  • Gordon Campbell: On The Best Albums Of 2016

    OK, I’m not even going to try and rationalise this surrender to a ‘best of’ listicle. Still…maybe there is an argument for making some semblance of narrative order out of a year that brought us Trump, Brexit and the deaths of Prince, David Bowie, Leonard Cohen and Alan Vega, who I missed just as much as the Big Three. So without further ado….oh, but first a word from the sponsor More>>

    Emojis: World’s First Māori Emoji App Launched

    It’s here - the world’s first Māori emoji app Emotiki has landed just in time for summer roadtrips and santa stockings, with 200 Māori and Kiwi cultural icons for people to share their kiwiana moments with each other and the world. More>>

    ALSO:

    Howard Davis: Album Of The Year - Van Morrison's 'Keep Me Singing'

    2016 was a grand year for Van The Man - The Belfast Cowboy turned 71, received a knighthood, and reissued an expanded set of soul-fired live recordings from 1973 ('It's Too Late to Stop Now'). In the game for 53 years now, Morrison's albums consistently open new windows into the heart and soul of one of the most enigmatic figures in modern music. More>>

    Review: The NZSO Performs Handel's Messiah

    Max Rashbrooke: Saturday night's performance took the piece back to something like the way it would have originally been performed when premiered in 1742, with an orchestra of 20-30 players and only a few more singers. More>>

    Culture: Rare Hundertwasser Conservation Posters Found After 40 Years

    When Jan and Arnold Heine put a roll of conservation posters into storage in 1974 they had no idea that 42 years later they would be collectors items. More>>

    Get More From Scoop

     
     

    LATEST HEADLINES

     
     
     
     
    Health
    Search Scoop  
     
     
    Powered by Vodafone
    NZ independent news