GPT and Abdominal obesity: Age, Sex, Race, PIR, Education Attainment, Central Obesity, Calcium, Phosphorus, ALP, ALT, AST, 25(OH)D3, Physical Activity Level, Use of Glucocorticoid, Fracture History, Smoked At Least 100 Cigarettes in Life, Had At Least 12 Alcohol Drinks Past 1 Year, Hypertension