Table 2.

Relationships between ICU length of stay (LOS) and clinical characteristics

A. Mean changes in ICU LOS with levels of binary characteristics (absent, present)
	ICU LOS (n, mean ± SD)
Clinical characteristic	Absent		Present		P-value1
Mechanical ventilation	99	5.9 ± 5.2	81	11.5 ± 10.6	< 0.001
Facial fracture	147	8.6 ± 8.6	33	7.4 ± 8.1	0.32
Rib fracture	97	8.6 ± 9.0	83	8.2 ± 7.9	0.99
Pelvic fracture	140	8.5 ± 9.0	40	8.0 ± 6.6	0.76
Long bone fracture	111	8.2 ± 8.7	69	8.7 ± 8.3	0.17
Surgery	69	7.1 ± 6.3	111	9.2 ± 9.6	0.08
Blunt injury	25	8.0 ± 7.9	155	11.2 ± 11.7	0.36
B. Correlations with ICU LOS
Clinical characteristic	Mean ± SD		Correlation		P-value2
ISS	19 ± 12		0.25		0.001
Opiates 1 day	101 ± 113		0.26		0.001
Opiates 3 day	299 ± 340		0.36		< 0.001

¹Wilcoxon test;

²For testing correlation equals zero.