Fig. 1. Probabilities for assignment of individual rats at 6 h after injury to different aspiration groups. Rats were injured by tracheal instillation of normal saline (NS;  A ); small nonacidified gastric particles (SNAP;  B ); NS plus HCl, pH = 1.25 (ACID;  C ); or combined acid and small gastric particles, pH = 1.25 (CASP;  D ). n = 12 for each injury group. Each  bar represents an individual rat and displays the probabilities that it would be classified as the indicated predicted injury based on its bronchoalveolar lavage cytokine profile (  black = CASP;  cross-hatched = ACID;  checkered = SNAP;  shaded = NS). * Rat misclassified as CASP-injured. # Rat misclassified as ACID-injured.