Table 1.

Pregnancy outcome rates in the United States, 2006^a,b

^aMartin JA, Hamilton BE, Sutton PD, Ventura SJ, Menacker F, Kirmeyer S, et al. Births: final data for 2006. Natl Vital Stat Rep 2009 Jan 7;57: 1-104.

^bMathews TJ, MacDorman MF. Infant mortality statistics from the 2005 period linked birth/infant death data set. Natl Vital Stat Rep 2008 Jul 30;57:1-32.

PTB = preterm birth

LBW = low birthweight