GPT and fatty liver disease: Several other traits previously reported to be related to birth order were also identified, including blood pressure2 (cardiac autonomic responses (deceleration capacity), diastolic blood pressure, systolic blood pressure, atherosclerosis, preeclampsia, maternal hypertensive disorders in pregnancy), metabolism4 (serum liver enzyme levels (alanine aminotransferase, ALT), serum liver enzyme levels (gamma-glutamyl transferase, GGT), metabolic trait, hepatic steatosis, hepatic fat), birth weight52 and body mass index (BMI)53.