Seasonal average for all 10 year olds was 25 nanograms
Apparently vitamin D levels were not measured at age 15, just academic performance
Paper does not appear to indicate the criteria for establishing that there was no relationship between vitamin D and intelligence:
Possibilities for a standard study would typically have included one of the following
- assigning kids to 4 vitamin D ranges – say 0-9 ng, 10-19 ng, 20-29 ng, and >30 ng
- assigning kids into two categories: above and below some amount – say 20 ng
This study used NO ranges/categories
This study did not even measure vitamin D levels at age 15.
The study attempted to predict how much higher the vitamin D levels would be at age 15
based on patents estimates of how long the kids were out of doors at age 9
The lack of criteria or vitamin D measurements at the time of the academic test
did not stop the web from drawing invalid conclusions
Titles of articles based on this paper indicate that the reporters have little understanding of science
Vitamin D Not Tied to School Performance
Vitamin D does not seem to boost kids' brainpower
Does Vitamin D Enhance Academic Performance? Probably Not
Vitamin D May Not Improve Academic Performance in Children
Vitamin D's Brain Benefits May Not Emerge Until Adulthood
Vitamin D Doesn't Help Kids Do Better in School, Study Finds
Vitamin D `not tied to boosting kids` brainpower`
Vitamin D May Not Improve Academic Performance
Study Shows That Vitamin D Does Not Improve Brain Activity in Teenagers
Vitamin D Doesn’t Help Kids Do Better in School, Study Finds
The paper is attached at the bottom of this page
I do not want to dignify the paper by even putting the title of the paper on this page
See much better in VitaminDWiki
- Cognition in young adults not improved with vitamin D if already have enough – Nov 2011 - a much better study for a similar age group
- Overview Cognition and vitamin D generally for seniors
- Poorer teen cognition due to lower vitamin D or race – Dec 2010