Intussusception incidence among children <1 year of age by region.

a: rate for <2 year olds in the paper; we recalculated rate for <1 year of age based on presented data.
b: midpoint of the range presented in the study.
c: rates presented for <6 and 6–11 months in the paper; we recalculated rates for <1 based on these data.
d: rates by age in months for the most recent surveillance years 1995–1999 were obtained from figure using Digitize-It; mean incidence for <1 presented {Fischer, 2004 #39}.