Table 1. Characteristics of pediatric intussusception cases during the overall study duration (2007–2017) in South Korea.
| Variable | No. of patients | Incidence (/105 person-yr) | IRR (95% CI) | Age (mo) | |
|---|---|---|---|---|---|
| Total patients | 30,444 (100.0) | 28.3 | 18.7 (10.6–30.1)* | ||
| Boys | 19,530 (64.2) | 34.8 | 1.64 (1.61–1.68) | 19.7 (11.2–31.4)* | |
| Girls | 10,914 (35.8) | 21.2 | Reference | 16.9 (9.8–27.7)* | |
| Only one admission or hospital visit | 27,218 (89.4) | 25.3 | 19.0 (10.8–30.5) | ||
| Only enema procedure | 24,577 (80.7) | 22.8 | 19.1 (11.0–30.1) | ||
| Surgery after enema failure | 666 (2.2) | 0.6 | 16.3 (8.5–29.8) | ||
| Primary surgery | 1,975 (6.5) | 1.8 | 17.5 (8.9–38.0) | ||
| Post-discharge recurrence | 3,226 (10.6) | 3.0 | 21.1 (11.8–33.2) | ||
| Only enema reduction | 2,572 (8.4) | 2.4 | 21.4 (12.2–33.2) | ||
| Surgery after enema failure | 552 (1.8) | 0.5 | 23.9 (12.6–40.2) | ||
| Primary surgery without enema | 102 (0.3) | 0.1 | 15.7 (8.0–32.5) | ||
| Number of post-discharge recurrences | 3,226 (100.0) | 3.0 | |||
| 1 | 2,562 (79.4) | 2.4 | |||
| 2 | 466 (14.4) | 0.4 | |||
| 3 | 129 (4.0) | 0.1 | |||
| 4 | 36 (1.1) | 0.03 | |||
| ≥5 | 33 (1.0) | 0.03 | |||
Values are presented as number (%) or median (interquartile range). The incidence was calculated by dividing the number of new cases by the corresponding population size as published by Statistics Korea (Korean National Statistical Office).
IRR: incidence rate ratio, CI: confidence interval.
The IRR and 95% CI were calculated using Poisson regression.
*Children's age at the first intussusception occurrence.