Authors Year Population (Prone-Supine) P Value Overall pts P Value Subgroup Severely ill patients n° of RCTs
Tiruvoipati R et al. [14] 2008 1271 (662-609) 0.91 - 5
Alsaghir AH et al. [20] 2008 1271 (662-609) 0.92 0.006* 5
Kopterides P et al. [21] 2009 1271 (662-609) 0.97 0.001* 4
Fessler HE et al. [22] 2010 466 (241-255) 0.41 0.006* 3
Sud S et al. [8] 2010 1786 (919-867) 0.54 0.01** 10
Gattinoni et al. [9] 2010 1573 (764-809) 0.66 0.03** 4
Abroug F et al. [11] 2011 1675 (862-813) 0.39 0.048** 7
*p value in subgroup of patients with SAPS II > 50; **p value in subgroup of patients with P7F < 100
Table 2: Main recent meta-analysis comparing prone vs. supine position in ARDS patients.