| ||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 Louisville, late preterm birth rates were highest for women ages 40 and older (11.6%), followed by women ages 30-39 (10.1%), under age 20 (10.0%) and ages 20-29 (9.6%). |
| ||Of all infants born during 2008-2010 (average), 10.9% were to mothers under the age of 20, 55.1% were to mothers ages 20-29 years, 32.0% were to mothers ages 30-39 years, and 2.0% were to mothers ages 40 and older. |
National Center for Health Statistics, final natality data.
Retrieved May 19, 2013, from www.marchofdimes.com/peristats.