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. Author manuscript; available in PMC: 2015 Dec 13.
Published in final edited form as: J Neurosurg. 2015 Mar 20;122(5):1120–1126. doi: 10.3171/2014.9.JNS132882

TABLE 6.

Rates of BSI, VAP and BSI and VAP combined for each period

Variable Period 1 Period 2 p Value
BSI (%) 8 (1.3) 0 (0) 0.12
VAP (%) 5 (0.8) 0 (0) 0.3378
VSI+VAP (%) 13 (2.0) 0 (0) 0.026

* Fisher exact test, 2-tailed.