Table 4.

Results of multivariate analyses of risk factors for delirium

Variables	Overall cohort		COPD cohort		Non-COPD cohort
	OR (95%CI)	p	OR (95%CI)	p	OR (95%CI)	p
Age, years	1.06 (1.04–1.08)	< 0.01	1.06 (1.03–1.09)	< 0.01	1.07 (1.05–1.09)	< 0.01
GCS	0.67 (0.56–0.79)	< 0.01	0.74 (0.60–0.92)	< 0.01	0.48 (0.37–0.63)	< 0.01
APACHE II score	1.07 (1.03–1.13)	< 0.01	1.08 (1.00–1.15)	0.04	–	–
MAP	0.99 (0.98–1.00)	0.01	0.98 (0.97–0.99)	< 0.01	–	–

NIV = noninvasive ventilation, OR = odds ratio, CI = confidence internal, GCS = Glasgow coma scale, RR = respiratory rate, MAP = mean arterial pressure, COPD = chronic obstructive pulmonary disease

Reasons for NIV, sex, age, underlying disease, APACHE II score, GCS, heart rate, respiratory rate, pH, PaCO₂, and PaO₂/FiO₂ were entered into multivariate analyses to identify independent risk factors for delirium