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Table 1 Characteristics of intussusception incident cases included in the overall study cohort (2002–2012)

From: Intussusception hospitalizations incidence in the pediatric population in Italy: a nationwide cross-sectional study

  No. % Incidence (per 100,000) IRR (IC 95 %)
Total 20,524   21  
 Male 11,321 55.2 23 1.16 (1.13–1.20)
 Female 9203 44.8 19 Ref
Age
 1–5 weeks 89 0.4 15 Ref
 6–14 weeks 196 1.0 19 1.22 (0.95–1.57)
 15–24 weeks 541 2.6 47 3.04 (2.43–3.80)
 25–32 weeks 561 2.7 60 3.94 (3.15–4.93)
 33–52 weeks 957 4.7 41 2.69 (2.16–3.34)
 1–3 years 2794 13.6 15 1.00 (0.81–1.23)
 4–6 years 2699 13.2 15 0.97 (0.79–1.20)
 7–9 years 4349 21.2 24 1.56 (1.27–1.93)
 10–12 years 4875 23.8 26 1.72 (1.40–2.21)
 13–15 years 3463 16.9 18 1.20 (0.97–1.48)
Geographical area
 North Italy 4968 24.2 12 Ref
 Central Italy 3408 16.6 19 1.61 (1.54–1.68)
 South Italy, Sicily and Sardinia 12,148 59.2 32 2.65 (2.56–2.74)
Risk factors (previous 6-month hospitalizations)
 Yes 291 1.4   
 No 20,233 98.6   
Severity
 Intussusception 18,000 87.7   
 Intussusception requiring surgery 2036 9.9   
 Intussusception requiring enema 488 2.4   
Recurrence (1 year following the first episode)
 Yes 759 3.7   
 No 19,765 96.3