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Location: Houston
Topic: Late preterm by maternal age
Format: Bar Graph
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Late preterm by maternal age: Houston, 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 Houston, late preterm birth rates were highest for women ages 40 and older (13.7%), followed by women under age 20 (10.0%), ages 30-39 (9.6%) and ages 20-29 (8.7%). 
• Of all infants born during 2011-2013 (average), 10.4% were to mothers under the age of 20, 51.3% were to mothers ages 20-29 years, 35.4% were to mothers ages 30-39 years, and 3.0% 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 October 06, 2015, from www.marchofdimes.org/peristats.