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Table 1 Characteristics of the included studies

From: An updated study-level meta-analysis of randomised controlled trials on proning in ARDS and acute lung injury

Trial Disease PaO2/FiO2 ratio SAPS II Population Prone (n) Supine (n) Actual prone duration/day (hours) Crossover allowed Protective lung ventilation Jadad score
Gattinoni_2001 [1] ALI/ARDS (6%/94%) 127 40 304 152 152 7 Yes No 3
Guerin_2004 [2] ALI/ARDS (21%/31%) and other causes of ARF (pneumonia; acute on chronic ARF; CPE, coma) 153 46 791 413 378 8 Yes No 3
Voggenreiter_2005 [3] ALI/ARDS (45%/55%) (trauma) 222 NA 40 21 19 11 No Yes 3
Mancebo_2006 [16] ARDS 145 41 136 76 60 17 Yes Yes 3
Chan_2007 [21] ARDS 109 NA 22 11 11 24 No Yes 1
Fernandez_2008 [17] ARDS 120 38 40 21 19 20 Yes Yes 3
Taccone_2009 [10] ARDS 113 40 342 168 174 18 Yes Yes 3
Total/mean   141 ± 39   1,675 862 813 15 ± 6    
  1. ALI, acute lung injury; ARDS, acute respiratory distress syndrome; ARF, acute respiratory failure; CPE, cardiogenic pulmonary oedema; SAPS II, Simplified Acute Physiology Score II.