DPP4 and metabolic syndrome: BMI: body mass index; BP: blood pressure; DPP4i: dipeptidyl peptidase 4 inhibitor; FCPGR: fasting C-peptide to glucose ratio; FSG: fasting serum glucose; HbA1C: glycated haemoglobin; HDL: high density lipoprotein cholesterol; MetS: metabolic syndrome; N: number; SD: standard deviation; SGLT2i: sodium-glucose cotransporter-2 inhibitor; SU: sulfonylurea; TG: triglyceride; TyG index: triglyceride glucose index; WC: waist circumference.