INS and type 2 diabetes mellitus: The indices of body mass index (BMI), systolic blood pressure (SBP), diastolic blood pressure (DBP), waist circumference, fasting plasma glucose (FPG), fasting plasma insulin (FINS), homeostasis model assessment (HOMA)-IR and HOMA-IS in the normal glucose tolerance (NGT), impaired fasting glucose (IFG) and T2D groups increased linearly, and the physical activity index (PAI) and HOMA-β decreased linearly (Ptrend < 0.05).