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Study strengthens link between tobacco smoke and behavioral problems in boys with asthma
Date:12/4/2008

CINCINNATI Boys with asthma who are exposed to environmental tobacco smoke have higher degrees of hyperactivity, aggression, depression and other behavioral problems, according to researchers at Cincinnati Children's Hospital Medical Center.

In a study posted online ahead of print by the Journal of Developmental and Behavioral Pediatrics, the researchers said behavioral problems increase along with higher exposure levels, but they added even low levels of tobacco smoke may be detrimental to behavior.

"These findings should encourage us to make stronger efforts to prevent childhood exposure to tobacco smoke, especially among higher risk populations, such as children with asthma," said Kimberly Yolton, Ph.D., lead author of the study and a researcher at the Children's Environmental Health Center at Cincinnati Children's.

Interestingly, although girls in the study were on average exposed to higher levels of tobacco smoke than boys, the exposure did not lead to an increase in behavioral problems among them, investigators said. In boys, however, behavioral problems increased about two fold with each doubling in their tobacco smoke exposure, said Dr. Yolton.

There have been studies involving adults and animals pointing to a difference in tobacco smoke's behavioral impact on males and females. Even so, the Cincinnati Children's authors said additional research is needed to explain why they observed different degrees of behavioral impact among the 220 boys and girls, ages 6-12, in the study.

"The largest increase we observed was in overall behavioral problems, but it was interesting that in addition to externalizing behaviors like hyperactivity and aggression we also saw an increase in internalizing behaviors, such as depression," explained Dr. Yolton. "Few studies have found a link between tobacco smoke and depression in children."

Although no data exist to specifically explain why tobacco smoke causes
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Contact: Nick Miller
nicholas.miller@cchmc.org
513-803-6035
Cincinnati Children's Hospital Medical Center
Source:Eurekalert

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