ot, CDC: more twin births - Three Decades of Twin Births in the United States, 1980–2009 - January 2012

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http://www.cdc.gov/nchs/data/databriefs/db80.htm

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* Key findings <http://www.cdc.gov/nchs/data/databriefs/db80.htm#findings>

* One in every 30 infants born in 2009 was a twin.

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#one%20in%20every%2030>

* Twin birth rates increased in all states from 1980 through 2009.

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#birth%20rates%20increase>

* Twin birth rates doubled among non-Hispanic white mothers over the

three decades.

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#non-Hispanic%20white%20mothers\

>

* Twinning rates rose by more than 200 percent among women aged 40 and

over.

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#Twinning%20rates>

* The age distribution of women giving birth changed over the three

decades.

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#age%20distribution>

* Older maternal age accounts for only about one-third of the rise in

twinning over the 30 years.

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#Older%20maternal%20age>

* Summary <http://www.cdc.gov/nchs/data/databriefs/db80.htm#summary>

* Definitions

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#definitions>

* Data sources and methods

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#source>

* About the authors

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#authors>

* References <http://www.cdc.gov/nchs/data/databriefs/db80.htm#references>

* Suggested citation

<http://www.cdc.gov/nchs/data/databriefs/db80.htm#citation>