December 18, 2008 -- Adolescent health risk behaviors often occur together, suggesting that youth involvement with one risk behavior may inform understanding of other risk behaviors, but in a study to examine the association between involvement in non-sexual risk behaviors and trends among sexual behaviors, Mailman School of Public Health researchers found that sexual behaviors vary considerably between those youth engaged in no risk health behaviors and those engaged in multiple health risk behaviors. Despite these differences, trends in sexual risk behaviors among youth engaged in multiple nonsexual risk behaviors -- such as smoking and driving while drinking -- and those engaged in few or no risk sexual behaviors are remarkably similar. Study findings from the Journal of Adolescent Health are published online.
"These analyses suggest caution about assuming that one can readily improve sexual risk behaviors by targeting other teen risk behaviors," says John Santelli, MD, MPH, professor and chair of the Heilbrunn Department of Population and Family Health at the Mailman School of Public Health, and lead author. "Trends in nonsexual health risk behaviors are quite different from patterns of change in sexual behavior and thus are unlikely to be driving trends in sexual behaviors, despite the strong associations between non sexual and sexual risk behaviors."
Dr. Santelli and his team analyzed data from the Youth Risk Behavior Survey, a nationally representative survey of U.S. high school students, collected from 1991 to 2007. Students were categorized into groups according to risky behaviors — such as smoking or alcohol use — and each group was examined for trends in four sexual behaviors: ever having sexual intercourse, having four or more lifetime partners, current sexual activity, and the use of contraception during the last sexual experience.
The findings indicate that students who engaged in nonsexual high risk behaviors were three times more likely than lower risk students to say they had had four or more lifetime sexual partners. About 87 percent of students engaging in the highest risk behaviors ever had sex, compared with only 13 percent of those engaging in low or no risk nonsexual behaviors.
However, the data confirm no matter where they fell on the risk spectrum, teens seemed positively influenced by social forces and intervention messages in the 1990s and early 2000s, when there was a decline in sexual experience and number of sexual partners across the board.
"The three biggest changes in adolescent behaviors in the last 16 years have been delaying sex, increasing the use of condoms, and reducing the number of partners," notes Dr. Santelli. "All three are areas that HIV education has clearly identified as goals."
However, while interventions aimed at reducing risky sexual behaviors in adolescents seemed successful for a while, the new data also show that this trend might be reversing, Dr. Santelli said. He also suggests that recent increases in sexual risk behaviors may have ominous implications for prevention of unplanned pregnancy and STIs among youth.
Visit www.jahonline.org for the full study findings. Santelli J, et al. Trends in sexual risk behaviors, by nonsexual risk behavior involvement, U.S. high school students, 1991�. J Adolesc Health online, 2008.
About the Mailman School of Public Health
The only accredited school of public health in New York City, and among the first in the nation, Columbia University's Mailman School of Public Health provides instruction and research opportunities to more than 1000 graduate students in pursuit of masters and doctoral degrees. Its students and more than 300 multi-disciplinary faculty engage in research and service in the city, nation, and around the world, concentrating on biostatistics, environmental health sciences, epidemiology, health policy and management, population and family health, and sociomedical sciences. www.mailman.hs.columbia.edu
Journal
Journal of Adolescent Health