GPT and Intervertebral disk degeneration: There is no statistical difference in the levels of phosphocreatine isoenzyme, phosphocreatine kinase, glutamic oxaloacetic transaminase, glutamic pyruvic transaminase, glutamyl transpeptidase, monoamine oxidase, total bilirubin, direct bilirubin, indirect bilirubin, glucose, urea nitrogen, and uric acid on intervertebral disc degeneration, facet joint degeneration, and endplate inflammation (P > 0.05) (see Supplementary Tables 2, 3).