A review of the intussusception literature suggests a mean incidence of 74 per 100,000 among children <1 year of age, with peak incidence among infants 5-7 months of age. In the US, intussusception occurs in 18 to 56 per 100,000 infants, most commonly in infants aged between 5 and 7 months. Boys are more commonly affected than girls. Up to 75% of cases occur in children under the age of 12 months.In Chile, an incidence of 32 to 35 per 100,000 infants has been reported with an incidence of 47 to 55 per 100,000 per year in infants aged under 1 year. The incidence in Hong Kong is reported at 89 to 101 per 100,000 (1997 to 1999). In a prospective study (261 infants with intussusception) in the UK and Ireland, the peak incidence was between the ages of 5 to 9 months.Incidence data derived from studies that exclude children ≥12 months of age may be subject to bias.
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