Inclusion Criteria:  Male or female, between 12 and 24 years old included at the time of the study Subject listed in the EPIMAD registry suffering from certain or probable Crohn's disease, or certain or probable ulcerative colitis, or certain or probable ulcerative proctitis Disease diagnosed before the age of 17 (pediatric onset disease) Patient residing in the area of the EPIMAD register at the time of diagnosis: Nord, Pas-de-Calais, Somme or Seine-Maritime Patient not opposing the research Patient not having objected to the use of these data for ancillary studies when registering in the EPIMAD register  Exclusion Criteria:  No exclusion criteria