Table 6

Univariable and multivariable analysis, by generalised estimating equation models, for mortality in the intensive care unit

	Univariable			Multivariable
	OR	95% CI	p-Value	OR	95% CI	p-Value
Age, per year	1.017	1.013 to 1.020	<0.001	1.011	1.006 to 1.015	<0.001

Gender
Male	1 (reference)
Female	0.96	0.85 to 1.08	0.514

Body mass index by category
Underweight	1 (reference)
Normal	0.91	0.67 to 1.25	0.573
Overweight	0.89	0.65 to 1.23	0.506
Obese	0.87	0.62 to 1.22	0.422
Severely obese	0.80	0.53 to 1.22	0.302
Simplified acute physiology score, per point	1.040	1.036 to 1.044	<0.001	1.032	1.037 to 1.036	<0.001

Reason of mechanical ventilation
Postoperative acute respiratory failure	1 (reference)			1
Asthma	0.50	0.21 to 1.17	0.112
Neuromuscular disease	0.95	0.47 to 1.91	0.887
Trauma	1.00	0.70 to 1.43	0.965
Chronic obstructive pulmonary disease	1.29	0.92 to 1.82	0.132
Congestive heart failure	1.89	1.39 to 2.58	<0.001	1.59	1.15 to 2.20	0.004
Other acute respiratory failure	2.03	1.55 to 2.66	<0.001	1.78	1.35 to 2.35	<0.001
Coma	2.27	1.82 to 2.83	<0.001	2.04	1.62 to 2.57	<0.001
Aspiration	2.68	1.82 to 3.92	<0.001	2.03	1.36 to 3.03	<0.001
Community pneumonia	2.81	2.14 to 3.69	<0.001	2.34	1.76 to 3.12	<0.001
Chronic pulmonary disease non-chronic obstructive pulmonary disease	3.33	2.10 to 5.30	<0.001	4.53	2.75 to 7.46	<0.001
Hospital pneumonia	3.52	2.45 to 5.06	<0.001	2.93	2.01 to 4.28	<0.001
Cardiac arrest	4.43	3.26 to 6.02	<0.001	2.64	1.92 to 3.64	<0.001
Sepsis	5.25	4.08 to 6.76	<0.001	3.72	2.86 to 4.84	<0.001
Acute respiratory distress syndrome	5.44	3.77 to 7.84	<0.001	4.75	3.21 to 7.00	<0.001

Ventilation
Invasive ventilation	1 (reference)			1 (reference)
Success non-invasive positive pressure ventilation	0.33	0.23 to 0.46	<0.001	0.39	0.27 to 0.57	<0.001
Failed non-invasive positive pressure ventilation	1.80	1.35 to 2.39	<0.001	1.79	1.31 to 2.44	<0.001