Table 3.

Multivariate analysis of factors associated with wave 2

Clinical features	OR [95% CI]	p value
Absence of fever at admission	5.23 [1.89; 14.48]	.0014
SAPS II at admission	0.95 [0.91; 0.99]	.0075
Invasive mechanical ventilation at 24 hours	3.49 [0.98; 12.52]	.0550
pO2/FiO2 ratio at 24 hours	0.99 [0.98; 0.99]	.0309
VAP	4.64 [1.54; 13.93]	.0063

CI = confidence interval, SAPS = simplified acute physiology score, VAP = ventilator acquired pneumonia.