“Adolescent girls and boys all are at risk for experimenting with sex, alcohol and drugs,” explains Carolyn Tucker Halpern. “Those who mature early are known to be at higher risk for these problems. But within that group, girls who have an older boyfriend appear to be at an extra risk for multiple high-risk behaviors such as intravenous drug use, marijuana use and sexual intercourse.”
The study was based on a nationally representative sample of about 4,000 adolescents who participated in the National Longitudinal Study of Adolescent Health. The students were under age 15 for the first part of the study, carried out during the 1994-1995 school year, and have been tracked since then through follow-up surveys. The results are published in the March 2007 issue of the journal Prevention Science.
But, is this not just sooooo obvious a result to anyone who has either been a teenager or is a parent observing the behavior of their offspring?
Full report here