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