Table 20.

Compare international data

CSF culture positive (rate/patient)	Simple size	Culture positive (pre-existing meningitis excluded)	Culture negative or pre-existing meningitis	% of positive culture (pre-existing meningitis excluded)	Fisher’s exact test (compared to data of this study) P value	Culture positive and correlated clinical and laboratory information	Not ventriculostomy related infection	% of infection with clinical correlation	Fisher’s exact test (compared to data of this study) P value
PYNEH (this study)	336	15	321	4.46		10	326	2.98
Mayhall et al. 1984	172	19	153	11.05	0.0078
Schultz et al. 1993	94	16	78	20.51	0.0001
Holloway et al. 1996	584	61	523	10.45	0.0012
Lyke et al.	157	11	146	5.61	0.2798
Sundbarg et al. 1988	540					54	486	10	0.0001