Based on the 2000 Health Barometer survey conducted in late 1999 on the health-related behaviors, attitudes, opinions, and knowledge of people aged 12 to 75, this two-volume work focuses on young people aged 12 to 25 nationwide across all regions, and more specifically on those in the regions of Alsace, Nord -Pas-de-Calais, Pays de la Loire, and Picardy. The survey was conducted among a sample of 2,765 young people and addresses risk factors or health indicators such as sports activities, tobacco, alcohol, and illicit drug use, suicidal thoughts and suicide attempts, violence, vaccination, and the use of condoms and contraception. The first volume presents a summary of national and regional results and includes the survey questionnaire. Each topic is introduced with a brief background, followed by a presentation of the results, illustrated with tables and figures, and a conclusion. The second volume details the results for each of the four regions mentioned above, covering the same topics.