Background Risk behaviours, such as smoking and physical inactivity account for up to two-
thirds of all cardiovascular deaths, and are associated with substantial increased mortality in …

We systematically searched 9 biomedical and social science databases (1980–2012) for
primary and secondary interventions that prevented or reduced 2 or more adolescent health …

Preventing unintended pregnancy and sexually transmitted diseases (STDs), including
human immunodeficiency virus (HIV) infection, among adolescents is a public health priority …

Positive youth development is thought to be essential to the prevention of adolescent risk
behavior and the promotion of thriving. This meta-analysis examined the effects of positive …

Background As marijuana legalization and acceptability increase in the US, it is important to
understand the potential impact on tobacco use. Accordingly, we assessed prevalence …

Abstract Background Young people in European countries are experiencing high levels of
alcohol and drug use and escalating levels of sexually transmitted infections. Individually …

Objective To identify barriers to condom use. Methods Data were extracted through
MEDLINE from papers published between 1993 and 2007. Surveys, reviews, clinical studies …

Background Health risk behaviours often co-occur in adolescence. This may be partially
explained by a set of common risk and protective factors. The current study examines the …

Background Past-month marijuana and tobacco use (co-use) are increasing among US
adults, but little is known about the prevalence of co-use among US youth. This study uses …

A large body of research has identified correlates of risky sexual behavior, with depressive
symptoms and marijuana use among the most consistent psychosocial predictors of sexual …