GPT and periodontitis: Serum glutamic oxaloacetic transaminase level (22.3 U/L vs. 20.7 U/L, P < 0.0001) and glutamic pyruvic transaminase level (22.4 U/L vs. 20.4 U/L, P = 0.0007) were higher in the periodontitis group than those in the control group.