Characteristics of the study group by categories of glucose regulation^a.

NGT: normal glucose tolerance; IFG: impaired fasting glucose; IGT: impaired glucose tolerance; i-IFG: isolated impaired fasting glucose; i-IGT: isolated impaired glucose tolerance; T2DM: type 2 diabetes; BMI: body mass index; WC: waist circumference; HT: hypertension; HDL: high density lipoprotein cholesterol; LDL: low density lipoprotein cholesterol; FPG: fasting plasma glucose; 2hPG: 2-hour plasma glucose; IMT: intima media thickness. amean ± standard deviation, median (first quartile, third quartile). bblood pressure of 140/90 mm Hg or higher, or antihypertensive medicine. caverage IMT of right and left common carotid artery.