Day 0 Day 2 Day 4
CC16      
Oxygenation index 0.12 0.41*** 0.24*
Lung injury score 0.22* 0.39*** 0.29*
SOFA score 0.37*** 0.53*** 0.50***
SP–D      
Oxygenation index 0.02 0.06 0.33*
Lung injury score 0.07 0.06 0.29*
SOFA score 0.02 0.22* 0.26*
CC16 Clara cell protein; SP–D surfactant protein D; SOFA sequential organ failure assessment; * P<0.05, ** P<0.01, *** P<0.001.
Table 2: Standardized coefficients (beta) of multivariate linear regression analysis.