Figure 2.

Correlation between serum heat shock protein (HSP) 47 levels and respiratory parameters. Significant correlation was demonstrated between serum HSP47 levels and (A) PaO₂/fraction of inspired oxygen ratio (P/F ratio) and (B) alveolar-arterial difference of oxygen (A-a DO₂). Each dot represents a patient with a diffuse alveolar damage (DAD) (closed circle), hypersensitivity pneumonitis (HP) (open circle), nonspecific interstitial pneumonia (NSIP) (quarry), or organizing pneumonia (OP) (triangle) pattern.