Readmissions after index hospitalization discharge for HH and matched controls by type of CCC. Shown are the 30-day all-cause readmission rates after index hospitalization for HH cases (in black) and controls (in gray). The bars labeled “overall” refer to a child with any CCC. Neonates are infants <30 days of age at index admission. The asterisks on the bars indicate statistically significant differences in readmission rate between HH cases and controls (*P < .001; **P value range, .001–.005).