Atlanta: The number of twins born in the US soared over the last three decades, mostly the result of test-tube babies and women waiting to have children until their 30s, when the chances of twins increase.In 2009, 1 in every 30 babies born in the US was a twin, an astounding increase over the 1 in 53 rate in 1980, according to a government report issued Wednesday."When people say it seems like you see more twins nowadays, they`re right," said Joyce Martin, an epidemiologist who co-authored the Centers for Disease Control and Prevention report.Some increase was expected as more women are delaying starting a family until they are over 30. For some unknown reason, mothers in their 30s are more likely to have twins than younger or older women. As much as a third of the increase can be attributed to that, Martin said.The rest of the rise is due to fertility drugs and treatments."You have a double whammy going on. There are more older moms and more widespread use of fertility-enhancing therapies," Martin said.Starting in the early 1980s, couples who had trouble conceiving began to benefit from medical advances like fertility drugs and in vitro fertilization and other procedures. These treatments became fairly widespread in the 1990s but are expensive, and availability and insurance coverage varies.
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