GPT and COVID-19: Regarding model 4, only ALT (OR = 1.12, 95% CI [1.0092, 1.24], p = 0.033), AST (OR = 1.13, 95% CI [1.00, 1.28], p = 0.036), and Serum ferritin (OR = 1.004, 95% CI [1.0003, 1.008], p = 0.031) can be used as predictors for COVID-19 critical illness, Table 4.