Table 2.

Incidence of 7-d colonic perforation risk by important risk factors

Patient variable	Frequ-ency	Perforat-ions	Incidence per 10000	Incident rate ratio (95%CI)
Total	80118	50	6.2	-
Age (yr)				1.071
				(1.05, 1.09)
18-49	13703	5	3.6
50-64	38705	10	2.6
65-79	22974	20	8.7
80+	4736	15	31.7
Gender
Female	41121	34	8.3	-
Male	38988	16	4.1	0.50 (0.27, 0.90)
BMI (kg/m2)				0.911 (0.86, 0.96)
< 24 (normal weight)	18019	21	11.7
25-29 (overweight)	26873	17	6.3
30+ (obese)	30873	10	3.2
Type of Colonoscopy
Therapeutic	37880	13	3.4	-
Screening	29901	3	1.0	0.29 (0.08, 1.03)
Diagnostic	12336	33	26.8	7.79 (4.10, 14.80)
Albumin result (percentile cut-offs)				0.151 (0.12, 0.20)
≤ 4.0	16537	36	21.8	7.76 (4.12, 14.64)
> 4.1	46366	13	2.8	-
ICU patients	94	9	957.4	186.9 (93.5, 373.5)
Non-ICU patients	80024	41	5.1	-
Inpatients	4155	23	55.4	15.6 (8.9, 27.1)
Outpatients	75963	27	3.6	-
Indications for CP
Abdominal pain				3.4 (1.5, ,7.6)-
Yes	3630	7	19.3
No	76488	43	5.6
Anemia				4.6 (1.8, 11.6)-
Yes	1880	5	26.6
No	78238	45	5.8
Bleeding				3.4(1.5, 7.6)-
Yes	3622	7	19.3
No	76496	43	5.6
Crohn’s disease
Yes	331	2	60.4	10.0
No	79787	48	6	(2.5, 41.2)

¹Variable was treated as continuous in the estimation of the incident rate ratio. ICU: Intensive care unit; CP: Cerebral palsy; BMI: Body mass index.