[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.