Previous studies exploring the association between arterial stiffness and prediabetes remain controversial. This study aimed to investigate the association of the different domains of prediabetes categorized by glycated hemoglobin A1c (A1c) 5.7-6.4%, impaired fasting glucose (IFG), fasting plasma glucose of 5.6-6.9 mmol/L, and impaired glucose tolerance (IGT), two-hour post-load glucose of 7.8-11.0 mmol/L, on arterial stiffness. These were measured by brachial-ankle pulse-wave velocity (baPWV). We enrolled 4938 eligible subjects and divided them into the following nine groups: (1) normoglycemic; (2) isolated A1c 5.7-6.4%; (3) isolated IFG; (4) IFG with A1c 5.7-6.4%; (5) isolated IGT; (6) combined IGT and IFG with A1c <5.7%; (7) IGT with A1c 5.7-6.4%; (8) combined IGT and IFG with A1c 5.7-6.4%; and (9) newly diagnosed diabetes (NDD). The baPWV values were significantly high in subjects with NDD��..
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