Table 1

Risk factors for CSF infection: infection rate comparison of non-exposed to exposed patients

		Risk factor present^1-151		RR	95% CI^1-152
		No	Yes	RR	95% CI^1-152
Type of initial monitor:
Ventriculostomy	4/109 (3.7)	12/106 (11.3)	3.4	1.0–10.7^1-150
CSF leak	13/205 (6.3)	3/10 (30.0)	6.3	1.5–27.4^1-150
Extracranial infection site	7/151 (4.6)	9/64 (14.1)	3.4	1.2–9.5^1-150
ICP monitoring >5 days	5/133 (3.8)	11/82 (13.4)	4.0	1.3–11.9^1-150
Patients with >1 ICPM	8/173 (4.6)	8/42 (19.0)	4.9	1.7–13.8^1-150
Skull fracture	11/166 (6.6)	5/49 (10.2)	1.6	0.5–4.9
Presence of multiple trauma	9/95 (9.5)	7/120 (5.8)	0.6	0.2–1.7
Penetrating head injury	15/199 (7.5)	1/16 (6.3)	0.8	0.1–6.6
ICP>20 mm Hg	7/139 (5.0)	9/76 (11.8)	2.5	0.9–7.1
Antibiotic prophylaxis given	6/87 (6.9	10/128 (7.8)	0.9	0.3–2.5
Intracranial haemorrhage	1/60 (1.7)	15/155 (9.7)	6.3	0.8–49.0
Location of placement:
Operating room	13/147 (8.8)	3/68 (4.4)	0.5	0.1–1.7
Emergency department	12/144 (8.3%)	4/71 (5.6%)	1.5	0.5–4.9
Intensive care unit	7/139 (5.0%)	9/76 (11.8%)	0.4	0.1–1.1

↵1-150 p<0.05.
↵1-151 Represented as the infection rate (%) in those without a particular characteristic and in those with the above characteristic.
↵1-152 Univariate logistic regression. All values p>0.05 for multivariate logistic regression.