Table 2

Mixed multiple logistic regression model

Variable	OR (95% CI)	P value
Days in ICU before study day
0–3 days	Reference
4–6 days in ICU before study day	2.29 (1.06 to 4.95)	0.03
7–9 days in ICU before study day	2.30 (0.91 to 5.84)	0.08
10–12 days in ICU before study day	7.77 (3.42 to 17.69)	<0.001
>12 days in ICU before study day	7.73 (3.94 to 15.15)	<0.001
Age, years	1.01 (0.99 to 1.03)	0.27
Male sex	0.98 (0.61 to 1.56)	0.92
Body mass index, kg/m²
18.5–25 (normal weight)	Reference
<18.5 (underweight)	1.97 (0.80 to 4.85)	0.14
25–30 (preobesity)	0.56 (0.32 to 1.08)	0.053
≥30 (obesity)	0.60 (0.34 to 1.07)	0.08
Braden score	0.77 (0.69 to 0.85)	<0.001
Admission type: medical	1.11 (0.47 to 2.60)	0.82
Admission type: elective surgery	0.83 (0.28 to 2.47)	0.74
Admission type: emergency surgery	1.03 (0.41 to 2.54)	0.96
Chronic obstructive pulmonary disease	0.96 (0.50 to 1.88)	0.92
AIDS	3.67 (0.27 to 50.17)	0.33
Heart failure	1.07 (0.51 to 2.22)	0.86
Peripheral vascular disease	0.97 (0.30 to 3.06)	0.95
Diabetes	1.22 (0.69 to 2.15)	0.49
Cirrhosis	2.25 (0.83 to 6.17)	0.11
Malignancy	0.90 (0.42 to 1.93)	0.80
Immunocompromised	1.96 (0.91 to 4.20)	0.09
Vasopressor use	0.64 (0.34 to 1.21)	0.17
Sedation	0.77 (0.40 to 1.47)	0.43
Muscle relaxant use	1.13 (0.31 to 4.12)	0.86
Mechanical ventilation on admission	1.34 (0.79 to 2.27)	0.28
Renal replacement	1.63 (0.83 to 3.22)	0.16
Simplified Acute Physiology Score II score	0.99 (0.97 to 1.01)	0.46

ICU, intensive care unit.