GPT and ventilator-associated pneumonia: Finally, alanine aminotransferase (pig reference value 10–40 UI/L) was 41.7 ± 16.4, 34.4 ± 13.9, and 25.8 ± 9.6 U/L in the control, EFB + PEEP, and Trendelenburg groups, respectively, (p < 0.001); whereas in the animals with VAP was 31.2 ± 13.8 and 37.3 ± 16.2 U/L without VAP (p = 0.914).