Newborn thyroxine levels and childhood ADHD.
OBJECTIVE
Normal brain development is highly dependent on adequate levels of iodine and thyroid hormone. It has been suggested that Attention Deficit Hyperactivity Disorder (ADHD) is the consequence of prenatal thyroidal endocrine disruption. The hypothesis was examined using neonatal thyroxine levels as a bio-marker of prenatal thyroid status and comparing it to subsequent development of ADHD.


METHODS
In a matched case-control study, cases were defined as children diagnosed with ADHD, while children born in the same hospital and tested on the same day served as matched controls. Conditional logistic regression analysis with unequal numbers of controls was performed.


RESULTS
The neonatal thyroxine levels were within normal limits for each of the children who were subsequently diagnosed as having ADHD, and their distribution was no different from that of their controls.


CONCLUSIONS
Children diagnosed with ADHD do not demonstrate prenatal thyroidal dysfunction as reflected in the newborn thyroxine levels, therefore neonatal thyroxine levels are not a bio-marker for the subsequent development of ADHD.
Soldin
Offie Porat
OP
Consultants in Epidemiology and Occupational Health, Inc., 2428 Wisconsin Avenue, N.W., Washington, DC 20007, USA. offie@ceoh.com
Nandedkar
Arvind K N
AK
Japal
Knoxley M
KM
Stein
Mark
M
Mosee
Shiela
S
Magrab
Phyllis
P
Lai
Shenghan
S
Lamm
Steven H
SH
D000367:Age Factors; D001289:Attention Deficit Disorder with Hyperactivity / Q000097:blood* / Q000503:physiopathology; D015415:Biomarkers / Q000097:blood*; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D016017:Odds Ratio; D012016:Reference Values; D012737:Sex Factors; D013974:Thyroxine / Q000097:blood*
D015415:Biomarkers; D013974:Thyroxine