Figure 1.

The 3 most common diagnoses versus less common diagnoses (Others, diseases diagnosed twice or once in the respective age group) in infants, young children, children, and adolescents with the leading symptom of hematochezia. Patients with infectious causes were pooled together (infectious diseases listed in order of frequency: Campylobacter; signs of GI infection, infectious work-up negative; Salmonella; norovirus; AAHC; CDI; Shigella; adenovirus; rotavirus; EHEC; hantavirus). AAC = antibiotic-associated colitis, AAHC = antibiotic-associated hemorrhagic colitis, CDI = Clostridium difficile infection, EHEC = entero-hemorrhagic Escherichia coli, FPIP = food protein-induced proctocolitis, IBD = inflammatory bowel disease.