| ||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 Los Angeles city, late preterm birth rates were highest for women ages 40 and older (11.8%), followed by women ages 30-39 (8.6%), under age 20 (8.1%) and ages 20-29 (7.6%). |
| ||Of all infants born during 2008-2010 (average), 10.0% were to mothers under the age of 20, 46.8% were to mothers ages 20-29 years, 38.7% were to mothers ages 30-39 years, and 4.4% were to mothers ages 40 and older. |
National Center for Health Statistics, final natality data.
Retrieved June 19, 2013, from www.marchofdimes.com/peristats.