Background: Protective factors associated with positive youth development predict health and education outcomes. This study explored trends in these protective factors and in physical activity among low-income students, and determined the impact of a school-based youth development program on these trends. Methods: This study used a…

This study examined cross-sectional correlates of smoking during early and late adolescence to compare patterns of prediction of smoking at both stages. Intention to smoke was the strongest predictor of smoking during both stages, particularly in late adolescence, as well as being the strongest predictor of changes in smoking. (SM)