1. Estimated pregnancy rates and rates of pregnancy outcomes for the United States, 1990-2008.;Ventura;Natl Vital Stat Rep,2012
2. Adolescent pregnancy and childbearing: levels and trends in developed countries.;Singh;Fam Plann Perspect,2000
3. Sexual Initiation, contraceptive Use and pregnancy among young adolescents.;Finer;Pediatrics,2012
4. Vital signs: teen pregnancyUnited States, 1991-2009.;MMWR Morb Mortal Wkly Rep,2011
5. Teenagers in the United States: sexual activity, contraceptive use, and childbearing, 2006-2010 national survey of family growth.;Martinez;Vital Health Stat,2011