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Location: Chicago
Topic: Late preterm by maternal age
Format: Bar Graph
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Late preterm by maternal age: Chicago, 2011-2013 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 2011-2013 (average) in Chicago, late preterm birth rates were highest for women ages 40 and older (12.4%), followed by women under age 20 (10.5%), ages 20-29 (8.7%) and ages 30-39 (8.3%). 
• Of all infants born during 2011-2013 (average), 9.4% were to mothers under the age of 20, 43.9% were to mothers ages 20-29 years, 43.0% were to mothers ages 30-39 years, and 3.7% were to mothers ages 40 and older. 


  • Late preterm is between 34 and 36 weeks gestation.


  • National Center for Health Statistics, final natality data.
  • Retrieved December 01, 2015, from