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 |