GPT and diabetes mellitus: In model 3, which adjusted for age, sex, BMI, physical activity, education level, smoking, ALT, diabetes, hypertension, hyperlipidaemia, the ORs (95% CI) of NAFLD in Q2, Q3 and Q4 compared with Q1 were 0.88 (0.64–1.21), 0.71 (0.51–0.98) and 0.67 (0.48–0.95), respectively.