TABLE 3 ] .

Univariable Comparison Between VAEs Under the New NHSN Definition, NHSN VAP Under the Former PNEU Definition, and All Other Patients

Outcome	VAE	NHSN-PNEU VAP	Neither VAE nor NHSN-PNEU VAP	Test of Difference
No.	246	30	6,585	...
Risk of in-hospital death, %	39	37	11	< .0001
Length of stay, mean (SD), d	25 (19)	23 (14)	9 (9)	< .0001
ICU length of stay, mean (SD), d	18 (13)	16 (10)	3 (4)	< .0001
Likelihood of going home or home with services, %	8	3	48	< .0001

Patients limited to 6,852 total patients who were admitted to the four ICUs reviewed for NHSN VAP during the 6 mo they were reviewed between 2008 and 2012. Nine patients were defined as having both VAE and NHSN VAP. Tests of significance were performed across VAE, NHSN VAP, both, and neither, using χ², Fisher exact, or Student t test where appropriate. NHSN-PNEU = National Healthcare Safety Network-Pneumonia; PNEU = pneumonia. See Table 1 and 2 legends for expansion of other abbreviations.