San Francisco
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Location: San Francisco
Topic: Late preterm by maternal age
Format: Bar Graph
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Late preterm by maternal age: San Francisco, 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 San Francisco, late preterm birth rates were highest for women ages 40 and older (10.0%), followed by women under age 20 (9.1%), ages 30-39 (6.2%) and ages 20-29 (6.0%). 
• Of all infants born during 2011-2013 (average), 2.1% were to mothers under the age of 20, 24.3% were to mothers ages 20-29 years, 64.3% were to mothers ages 30-39 years, and 9.3% 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 September 25, 2016, from