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Air pollution may be tied to preterm births
Published in Saudi Press Agency on 06 - 09 - 2006


Pregnant women who are exposed
to low levels of air pollution seem to have an increased risk
of giving birth before term, Australian researchers report, according to
Reuters.
Dr. C. Hansen, of the University of Queensland, Brisbane
and colleagues studied data on 28,200 live births in Brisbane
for the period of July 1, 2000 to June 30, 2003. The team
calculated the average maternal exposure for ambient
particulate matter (PM10), ozone, and nitrogen dioxide over the
first three months after the last menstrual period and the last
three months before birth.
There were a total of 1583 preterm births (5.6 percent),
defined as gestation of less than 37 weeks, the researchers
report in the British Journal of Obstetrics and Gynaecology.
A significantly higher percentage of preterm infants were
born during winter. Exposure to PM10 during the first trimester
was associated with a 15 percent increased risk of preterm
birth. Exposure to ozone was linked to a 26 percent increased
risk.
The researchers also found that the PM10 exposure effect
associated with the first trimester was strongly linked to
exposure during the first month after the last menstrual
period.
Although overall the effect was small, and did not reach
significance from a statistical standpoint, the investigators
stress that the ambient air pollution concentrations were also
relatively low.


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