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One out of 30 babies born in US is a twin
Tuesday April 03, 2012 01:10:33 PM,
IANS
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Washington:
Women conceiving at older ages, thanks to the availability of
fertility treatments, has spurred the birth of twins.
In 2009, one in every 30 babies born in the US was a twin compared
with one in every 53 in 1980, according to a new finding by
Michigan State University researchers.
"Prior to 1980, the incidence of US twin births was stable at
about two percent of all births, but it has risen dramatically in
the past three decades," said Barbara Luke from Michigan state.
She noted that twin births increased for women of all ages, with
the largest increases among women aged 30 and older. "Older
maternal age accounts for about one-third of the rise, and
two-thirds is due to the increased use of fertility treatments,"
added Luke.
Those fertility-enhancing therapies include both assisted
reproductive technologies and ovulation stimulation medications.
About 12 percent of US women have had fertility therapies,
according to a statement of Michigan State.
"With multiple births though there are greater health risks," said
Luke, researcher in the College of Human Medicine's Department of
Obstetrics, Gynaecology and Reproductive Biology at Michigan.
"Continued research is necessary to improve outcomes."
Luke, who first reported the numbers in a report with Joyce Martin
of the Centres for Disease Control and Prevention, noted that
births for triplets and higher numbers also grew: one in every 651
babies in 2009 compared with one in 2,702 in 1980.
These findings were presented at the 14th Congress of the
International Society of Twin Studies in Florence, Italy.
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