Table 3.

Multivariate logistic regression analysis for dural tear

	Odds ratio	95 % CI	p value
Age
0–17	0.64	0.41, 1.01	0.055
18–44	Ref.	–	–
45–64	1.52	1.35, 1.72	<0.001
65–84	2.63	2.29, 3.02	<0.001
≥85	2.8	2.14, 3.66	<0.001
Gender
Male	Ref.	–	–
Female	1.08	1.01, 1.16	0.02
Elixhauser comorbidity score
0	Ref.	–	–
1	1.23	1.12, 1.35	<0.001
2	1.23	1.1, 1.38	<0.001
3	1.27	1.12, 1.44	<0.001
4 or more	1.25	1.08, 1.45	<0.001
Hospital caseload
Low ≤229	Ref.	–	–
Middle (230–1,371)	1.1	0.75, 1.61	0.621
High ≥1,371	1.45	1.01, 2.09	0.044

Ref. reference