| ||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 Boston, late preterm birth rates were highest for women ages 40 and older (10.6%), followed by women ages 20-29 (8.7%), ages 30-39 (8.7%) and under age 20 (8.5%). |
| ||Of all infants born during 2008-2010 (average), 6.9% were to mothers under the age of 20, 40.6% were to mothers ages 20-29 years, 48.2% were to mothers ages 30-39 years, and 4.3% were to mothers ages 40 and older. |
National Center for Health Statistics, final natality data.
Retrieved June 19, 2013, from www.marchofdimes.com/peristats.