Inclusion criteria for the case group :  Cystic fibrosis followed at the pediatric (Centre de Ressources et de Compétences de la Mucoviscidose) in Strasbourg Aged from 6 to 17 years old Non hospitalized Able to read and understand French language Accompanied by at least one of his parents  Inclusion criteria for the control group :  Emergency surgical consultation Aged from 6 to 17 years old Non hospitalized Able to read and understand French langage Accompanied by at least one of his parents  Exclusion criteria:  Children under 6 years old Children over 17 years old Children and parents who don't understand or can't read French language Hospitalized children Children unaccompanied by their parents