Nuviala A, Teva-Villén MR, Grao-Cruces A, Pérez-Ordás R, García-Fernández J, Nuviala R. Validity, reliability and exploratory factor analysis of the dropout scale in sport centres. J. Hum. Sport Exerc. Vol. 7, No. 1, pp. 275-286, 2012. Sport dropout is a complex problem, in which multiple reasons influence. One lacks an instrument of easy application for the sport centres, which there contributes relevant information about dropout motives, at the time that it expires with the properties that any measurement's instrument must assemble. The aims of this work were to design, to validate and to verify the reliability of a useful instrument as way of evaluation of the motives of the dropout of the organized physical activity that provide the different sport centres. So, an inventory was made, a statistical analysis of the items was also made, so as an exploratory factor analysis and his validation and his reliability were analyzed. In conclusion, it can be stated that we have a valid and reliable tool to study the phenomenon of dropout in sport centres, which depends on five factors: leisure, enjoyment, satisfaction, practice and economic. The tool has 22 items in total, which makes its application easy.

The purpose of the study is to assess the effectiveness of a school-based programme to improve knowledge, attitudes and beliefs about doping. 540 adolescents (aged 12-13 years old, 50% boys) took part, from eight Spanish schools. Three hundred and thirteen of these were in the experimental group and the rest formed a control group. Six sessions were held, based on international recommendations, during the Physical Education classes, and were assessed with the Questionnaire on the Anti-doping Intervention programme. The principal results showed that the knowledge, attitudes and beliefs about doping improved in the experimental group compared to the control group, for the whole of the questionnaire (p<.001, Eta 2 =.03) and specifically for the factors Concept (p<.001, Eta 2 =.004), Utility (p<.01, Eta 2 =.02) and Sport and doping (p<.01, Eta 2 =.01). But there were no benefits observed in the factors Methods and Origin of the behaviour. In conclusion, school-based programmes may be useful for improving knowledge, attitudes and beliefs about doping among adolescents.