Table 8. Associated factors of pediatric intussusception in the first occurrence and in total occurrences.

Variable		First occurrence						Total occurrences (first occurrence plus post-discharge recurrence)
		No. of cases	%	OR	95% CI		p-value	No. of cases	%	OR	95% CI		p-value
Age (yr)
	0≤, <1	9,270	30.45	Reference				10,036	28.93	Reference
	1≤, <2	10,035	32.96	0.65	0.61	0.70	<0.0001	11,295	32.56	0.85	0.80	0.90	<0.0001
	2≤, <3	5,991	19.68	0.62	0.57	0.67	<0.0001	7,037	20.29	0.95	0.89	1.02	0.1581
	≥3	5,148	16.91	0.80	0.74	0.87	<0.0001	6,320	18.22	1.27	1.19	1.36	<0.0001
Sex
	Girls	10,914	35.85	Reference				12,188	35.14	Reference
	Boys	19,530	64.15	1.34	1.26	1.43	<0.0001	22,500	64.86	1.32	1.26	1.39	<0.0001
Season
	Spring (Mar to May)	7,413	24.35	Reference				8,401	24.22	Reference
	Summer (Jun to Aug)	8,782	28.85	0.92	0.85	0.99	0.0288	10,040	28.94	0.97	0.91	1.03	0.2908
	Autumn (Sep to Nov)	8,093	26.58	0.90	0.83	0.98	0.0113	9,233	26.62	0.98	0.91	1.04	0.4464
	Winter (Dec to Feb)	6,156	20.22	1.00	0.92	1.09	0.9640	7,014	20.22	1.03	0.96	1.10	0.4143
Type of hospital
	Hospital	274	0.90	1.01	0.74	1.37	0.9630	297	0.86	0.84	0.65	1.10	0.2074
	General hospital	15,043	49.41	Reference				16,907	48.74	Reference
	Tertiary hospital	15,127	49.69	1.08	1.02	1.14	0.0119	17,484	50.40	1.16	1.11	1.22	<0.0001
Total cases		30,444	100.00					34,688	100.00

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

OR and CI were analyzed using a multiple logistic regression model.