Table 3. Factors associated with use of IMV.

Variables	HR [95% CI]	p
PaO2 (for every 10-mmHg increase)	0.91 [0.84–0.99]	0.022
PaCO2	1.02 [0.98–1.06]	0.337
Age	1.02 [0.99–1.04]	0.235
pH (for every 0.01 increase)	1.02 [0.96–1.09]	0.565
CRP	1.00 [0.99–1.01]	0.824
Lymphocyte count	0.27 [0.09–0.81]	0.020
Lactate	1.56 [1.17–2.08]	0.003

Note:

CRP, C-reactive protein; HR, hazard ratio; CI, confidence interval.