Table 3 Analysis of univariate and multivariate logistic regression with backward stepwise selection on adjusting PEEP

Variables	Univariable analysis		Multivariable analysis
	OR	95%CI	p-value		Adjusted OR	95%CI	p-value
BMI (kg/m2)	1.44	1.14–1.82	0.002		1.5	1.12–2.02	0.007
Weight (kg)	1.12	1.04–1.20	0.002		NA	NA	NA
Initial PEEP setting (cm H2O)	0.57	0.38–0.85	0.006		0.54	0.3–0.98	0.044
Airway DP (cm H2O)	1.4	1.12–1.75	0.003		NA	NA	NA
Crs (ml/cm H2O)	0.81	0.7–0.93	0.004		0.81	0.7–1.01	0.069

CI, confidence interval; BMI, body mass index; Crs, compliance respiratory system; DP, driving pressure; OR, odd ratio; PEEP, positive end-expiratory pressure; NA, not applicable.