[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.

[Motivations for tobacco consumption among adolescents in an urban high school].

Objective: To determine the motivations (attitudes, beliefs and experiences) for tobacco consumption among adolescents.

Methods: This study was based on qualitative methodology using six 50-minute discussion groups with 6-8 adolescents per group during the 2008/09 school year. Purposive sampling was performed of 12-18 year-old adolescents attending a middle-class urban school (Jaén, Spain).

[Motivations for alcohol use among adolescents in an urban high school].

Objectives: To find out the motivation (attitudes, beliefs and experiences) behind adolescent alcohol consumption.

Design: Qualitative methodology, explanatory method, using conversational techniques (discussion group with 6-8 adolescents/group, 50min duration) recorded by videotape during the school year 2008/09.

Participants And Context: Adolescents 12-18 years-old of a middle-class urban school (Jaen-Spain).

[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.