VT of 10 ml/kg (n=74) VT of 6 ml/kg (n=76) P–value
Age (years) 58 (±17) 63 (±15) 0.06
Male sex 50 (68%) 49 (64%) 0.69
APACHE–II score 20 (±8) 21 (±7) 0.93
SOFA 8 (±4) 7 (±3) 0.19
LIS 1.2 (±0.6) 1.3 (±0.6) 0.08
Underlying ALI risk factors:     0.60
-Sepsis 7 4  
-Shock 6 9  
-Pneumonia 1 3  
-Aspiration   1  
-Pancreatitis   1  
-Trauma 12 10  
Blood transfusion 14 11 0.47
Chronic alcohol abuse 6 5 0.72
Smoking history 45 (61%) 58 (76%) 0.04
Baseline CC16 (ng/ml) 10.4 (5.2–21.6) 8.8 (5.6–18.9) 0.68
Baseline SP–D (ng/ml) 286 (159–518) 396 (236–528) 0.10
VT tidal volume; APACHE–II acute physiology and chronic health evaluation–II score; SOFA sepsis organ failure assessment score; LIS lung injury score; CC16 Clara cell protein; SP–D surfactant protein D
Table 1: Baseline characteristics.