Table 2.

Severity of gas exchange abnormalities in representative trials of patients with acute respiratory distress syndrome

Study	PaO2 (mm Hg)	PaO2 / FIO2
ARMA11	84 ± 28	135 ± 58
Brower et al.12	78 ± 22	168 ± 66
Steinberg et al.13	70 ± 14	126 ± 40
Mercat et al.15	Not reported	143 ± 57
Davies et al.5	Not reported	56 (IQR 48–63)
Papazian et al.51	85 + 28	115 ± 21

Reported data are from the control groups in each study.

IQR, interquartile range.