March of Dimes March of Dimes Peristats
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Late preterm by maternal age: Seattle, 2008-2010 Average

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• Maternal age is a risk factor for preterm birth, with higher preterm birth rates found among the youngest and oldest mothers in the U.S. 
• During 2008-2010 (average) in Seattle, late preterm birth rates were highest for women ages 40 and older (10.0%), followed by women under age 20 (7.0%), ages 30-39 (6.9%) and ages 20-29 (6.8%). 
• Of all infants born during 2008-2010 (average), 3.0% were to mothers under the age of 20, 31.0% were to mothers ages 20-29 years, 59.2% were to mothers ages 30-39 years, and 6.7% were to mothers ages 40 and older. 

Footnotes

  • Late preterm is between 34 and 36 weeks gestation.

Source

  • National Center for Health Statistics, final natality data.
  • Retrieved May 20, 2013, from www.marchofdimes.com/peristats.