Table 9. Associated factors of post-discharge recurrence and risks of surgical treatment in pediatric intussusception.

Variable		Total cases	Post-discharge recurrence						Surgery
			Cases (n)	%	OR	95% CI		p-value	Cases (n)	%	OR	95% CI		p-value
Age (yr)
	0≤, <1	10,036	1,936	19.29	Reference				1,319	13.14	Reference
	1≤, <2	11,295	2,313	20.48	1.08	1.01	1.16	0.0199	841	7.45	0.52	0.48	0.57	<0.0001
	2≤, <3	7,037	1,650	23.45	1.28	1.19	1.38	<0.0001	482	6.85	0.47	0.42	0.53	<0.0001
	≥3	6,320	1,571	24.86	1.36	1.26	1.46	<0.0001	839	13.28	0.98	0.89	1.07	0.6009
Sex
	Girls	12,188	2,254	18.49	Reference				1,085	8.90	Reference
	Boys	22,500	5,216	23.18	1.30	1.23	1.37	<0.0001	2.396	10.65	1.23	1.14	1.33	<0.0001
Season
	Spring (Mar to May)	8,401	1,772	21.09	Reference				918	10.93	Reference
	Summer (Jun to Aug)	10,040	2,195	21.86	1.04	0.97	1.12	0.2741	947	9.43	0.84	0.76	0.92	0.0003
	Autumn (Sep to Nov)	9,233	1,990	21.55	1.05	0.97	1.13	0.2127	849	9.20	0.80	0.73	0.89	<0.0001
	Winter (Dec to Feb)	7,014	1,513	21.57	1.04	0.97	1.13	0.2806	767	10.94	0.98	0.88	1.08	0.6830
Specialization of clinic
	Hospital	297	45	15.15	0.68	0.49	0.94	0.0177	36	12.12	1.30	0.91	1.86	0.1435
	General hospital	16,907	3,424	20.25	Reference				1,616	9.56	Reference
	Tertiary hospital	17,484	4,001	22.88	1.17	1.11	1.24	<0.0001	1,829	10.46	1.10	1.02	1.18	0.0113
Post-discharge recurrence
	No	27,218							2,641	9.70	Reference
	Yes	7,470							840	11.24	1.17	1.08	1.27	0.0002
Surgery
	No	31,207	6,630	21.25	Reference
	Yes	3,481	840	24.13	1.17	1.08	1.27	0.0002
Total cases		34,688	7,470						3,481

OR: odds ratio, CI: confidence interval, Mar: March, Jun: June, Aug: August, Sep: September, Nov: November, Dec: December, Feb: February.

OR and 95% CI were calculated using multiple logistic regression analysis.