1. Grunbaum JA, Kann L, Kinchen S, et al. Youth risk behavior surveillance—United States, 2003 [published correction appears in MMWR Surveill Summ. 2004;53(24):536]. MMWR Surveill Summ. 2004;53(2):1–96
2. Alan Guttmacher Institute. U.S. Teenage Pregnancy Statistics: Overall Trends, Trends by Race and Ethnicity and State-by-State Information. New York, NY: Alan Guttmacher Institute; 2004. Available at: www.agi-usa.org/pubs/state_pregnancy_trends.pdf. Accessed April 25, 2005
3. Centers for Disease Control and Prevention, National Center for HIV, STD, and TB Prevention, Division of STD Prevention. STD surveillance, 2000. Available at: www.cdc.gov/std/stats00/TOC2000.htm. Accessed February 3, 2005
4. Hallfors DD, Waller MW, Ford CA, Halpern CT, Brodish PH, Iritani B. Adolescent depression and suicide risk: association with sex and drug behavior. Am J Prev Med. 2004;27:224–230
5. Kosunen E, Kaltiala-Heino R, Rimpela M, Laippala P. Risk-taking sexual behaviour and self-reported depression in middle adolescence—a school-based survey. Child Care Health Dev. 2003;29:337–344