Prone positioning in acute respiratory distress syndrome after abdominal surgery: a multicenter retrospective study

Annals of Intensive Care

Table 3 Primary and secondary endpoints

	Overall	Prone	Supine	p
Primary endpoint^a, n (%)	41 (42)	14 (39)	27 (44)	0.65
Revision surgery^b, n (%)	17 (17)	3 (8)	14 (23)	0.10
All revision surgery^c	35 (36)	8 (22)	26 (42)	0.10
Duration of MV	10 [6–17]	9.5 [6–21]	11 [6–15]	0.72
ICU length of stay	13 [7–22]	13 [8–24]	13 [6–21]	0.77
ICU mortality^d, n (%)	43 (44)	15 (42)	28 (45)	0.43

MV mechanical ventilation, ICU intensive care unit
^aAt least one surgical complication that could be induced or worsened by prone position
^bFor primary endpoint
^cSeveral patients had more than one revision surgery
^dFive patients died in the first 48 h (two in the prone group and three in the supine group)