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©2013 UpToDate ® Print Email Age at onset of inflammatory bowel disease in children, by type The majority of children presenting prior to six years of age have isolated colonic disease (either ulcerative colitis or Crohn's colitis). Crohn's disease is the predominant form or inflammatory bowel disease in children presenting after eight years of age. Data from: Castro M, Papadatou B, Baldassare M et al. Inflammatory bowel disease in children and adolescents in Italy: Data from the pediatric national IBD register (1996-2003). Inflamm Bowel Dis 2008; 14:1246.