[CDC Office of Women's Health, Health Matters for Women] Effects of Maternal Age and Age-Specific Preterm Birth Rates on Overall Preterm Birth Rates — United States, 2007 and 2014

http://www2c.cdc.gov/podcasts/download.asp?af=h&f=8644080

Preterm birth rates declined for all age groups and overall from 10.41% to 9.54% of live births. Mean maternal age increased from 27.4 years to 28.3 years. The contribution of fewer births to teens and to women aged 20-24 years to the overall decline in preterm births was offset by increases in births to older mothers.

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