Dimensions of adolescent health behavior.
PURPOSE: To determine dimensions of healthy and unhealthy behaviors of young people aged 12 to 21 years to better inform measures of adolescent health behavior and assist in targeting appropriate strategies to promote health. METHODS: The study sample (N = 8730), derived from a U.S. national probability sample; 52.3% were female, 67% white, 15% African-American, 18% Hispanic, 22.2% aged 12-13 years, 38.4% aged 14-17 years, and 39.4% aged 18-21 years. Principal components analysis was done to examine the covariance structure of 42 healthy and unhealthy behaviors selected from the behavioral questions of the Youth Risk Behavior Survey (YRBS). RESULTS: A four-factor oblique rotation, comprised of 18 variables with factor loadings of.50 or greater, resulted in interpretable and meaningful health behavior factors. Sexual activity, substance use (e.g., alcohol, marijuana, and other drugs), smoking, and exercise factors accounted for 74% of the variance in the composite of healthy and unhealthy behaviors. These four factors were subsequently reproduced on random samples as well as on samples defined by age (12-13 years [excluding sexual activity variables], 14-17 years, 18-21 years), gender, and race (white, African-American, Hispanic). CONCLUSIONS: These results provide new information about the consistent structure of sexual activities and exercise behaviors across subgroups defined by age, gender, and racial/ethnic origins, and about differences in clusters of substance use behaviors across ethnic groups. Further study of diverse population-based samples and multiple health-promoting and health-negating behaviors should profile developmental variations and health protective factors in adolescents.