[Changes in hazardous drinking in Spanish adolescent population in the last decade (2004-2013) using a quantitative and qualitative design].

Objective: To determine the changes in hazardous drinking in adolescents in the last decade, as well as their motivations and experiences.

Design: Firstly, a descriptive design using a self-report questionnaire, and secondly an explanatory qualitative design, with video recordings of discussion groups with content analysis (coding, triangulation of categories and verification of results).

Setting And Participants: Pupils from an urban High School, administering a questionnaire every 3 years from 2004 to 2013.

[Efficiency of two motivational interventions for adolescent smokers (brief and intensive) conducted in high schools].

We set out to determine the efficiency of two motivational interventions (brief and intensive) in adolescent smokers, based on obtaining cognitive dissonance and seeking to help them stop smoking. A multicenter randomized experimental study was carried out at five high schools. Individual anti-smoking interventions were applied at the schools, the participants being adolescent smokers (≤ 20 years) who wished to quit smoking.

[Changes in structure and function of the family of the adolescent in the last decade (1997-2007)].

Objectives: To find out the structure and functioning of the family of the adolescent and its changes in the last decade.

Design: Cross-sectional descriptive study using questionnaires.

Setting And Population: Pupils in obligatory secondary education and high-school in one rural (Granada) and one urban (Jaén) area.

[Evolution of the consumption of toxic substances among the adolescents of an urban area (1997-2004)].

Objectives: To find the evolution of the consumption of alcohol, tobacco and other drugs among adolescents in an urban area.

Design: Descriptive, cross-sectional study using a self-administered questionnaire.

Setting: Secondary school (middle-class urban area).

[Family structure and function during adolescence: relationship with social support, tobacco, alcohol and drugs consumption, and psychic discomfort].

Objectives: To find out the family structure and functionality of the family of the adolescent and their relationships with social support, consumption of drugs and alcohol, and psychic discomfort.

Design: Cross-sectional descriptive study.

Setting And Population: Pupils in obligatory secondary education in one rural and one urban area.