Table 5.

Duration of mechanical ventilation (MV) as reported by the individual studies

Paper	Outcomes	Surgical group	Non-surgical group	P value
Tanaka et al. [11]		(n = 18)	(n = 19)
		Days (mean ± SD)
	Total MV	10.8 ± 3.4	18.3 ± 7.4	< 0.05
	MV after surgery	2.5 ± 3.2	N/A
Marasco et al. [12]		(n = 23)	(n = 23)
		Hours (mean ± SD)
	Invasive MV post-randomisation	151.8 ± 83.1	181.0 ± 130.2	0.37
Malhotra et al. [14]		(n = 13)	(n = 11)
		Days (mean ± SD)
	MV	12.6 ± 8.5	7.0 ± 4.2	N/A
Liu et al. [13]		(n = 25)	(n = 25)
		Days (median (IQR))
	MV	7 (6–10)	9 (7–12)	0.012
	MV with pulmonary contusion	9 (7–13)	10 (7–16)	0.063
	MV without pulmonary contusion	5 (3–8)	8 (5–12)	0.015

N/A not applicable, IQR interquartile range, SD standard deviation