Attitudes, beliefs and knowledge related to doping in different categories of football players.

Objectives: The aim of this study was to study and compare attitudes, beliefs and knowledge about doping of footballers, from elite to under-18 categories.

Design: The descriptive exploratory design used an instrument combining a validated questionnaire (Performance Enhancement Attitude Scale: PEAS) with qualitative open-ended questions.

Methods: A total of 1324 Spanish football players (average age 22.