Association analysis and exploratory mediation study of the stress-induced hyperglycaemia ratio and glycaemic ratio indices with diabetic retinopathy in patients with type 2 diabetes

Objective Diabetic retinopathy (DR) is a major microvascular complication of type 2 diabetes mellitus (T2DM), and traditional glycaemic control indicators struggle to comprehensively predict its risk. This study aims to investigate the association between the stress hyperglycaemia ratio (SHR), fasting blood glucose/glycated hemoglobin (FBG/HbA1c), postprandial 2-h glucose/glycated hemoglobin (P2hBG/HbA1c) with DR in T2DM patients, and the mediating effects of non-high-density lipoprotein cholest