Researchers out of the Cincinnati Children’s Hospital Medical Center have found that when combined, tobacco smoke and lead, ingested while pregnant, create a significant risk of symptoms of Attention Deficit Hyperactivity Disorder (ADHD) in children later in life.
The study, published today in the journal Pediatrics, focused on data collected from 2001 to 2004 on 3,907 children aged 8 to 15 in the United States. The researchers also polled mothers on their cigarette use during pregnancy.
Researchers found that when exposed to tobacco smoke prenatally, children were 2.4 times more likely to exhibit ADHD symptoms, and those exposed to lead were 2.3 times likely to have the symptoms. Researchers also pointed out that when looking at lead exposure in the blood, levels were found to be well below the Centers for Disease Control action level, suggesting that even small doses of the metal may have an effect on behavior.
When the two substances were combined in vitro, the team found an eight times higher risk of ADHD when compared to children not exposed to the two substances.
By Shawn Douglas Copyright © 2006-2009
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