Table 3.

Relationship between hospital length of stay (LOS) and clinical characteristics

A. Mean changes in hospital LOS with levels of binary characteristics (absent, present)
	Hospital LOS (n, mean ± SD)
Clinical characteristic	Absent		Present		P-value1
Mechanical ventilation	99	13.6 ± 10.6	81	24.4 ± 22.7	< 0.001
Facial fracture	147	18.5 ± 18.2	33	18.5 ± 16.6	0.830
Rib fracture	97	20 ± 20.5	83	16.7 ± 14.2	0.730
Pelvic fracture	140	18.4 ± 18.3	40	18.9 ± 16.7	0.220
Long bone fracture	111	15.3 ± 16.3	69	23.6 ± 19.2	< 0.001
Surgery	69	12.4 ± 9.5	111	22.3 ± 20.7	< 0.001
Blunt injury	25	16.7 ± 14.0	155	29.3 ± 31.3	0.220
B. Correlations with hospital LOS
Clinical characteristic	Mean ± SD		Correlation		P-value2
ISS	19 ± 12		0.20		0.006
Opiates 1 day	101 ± 113		0.22		0.003
Opiates 3 day	299 ± 340		0.32		< 0.001

¹Wilcoxon test;

²For testing correlation equals zero.