Correlation between diabetic peripheral neuropathy and thyroid hormone sensitivity in elderly patients with type 2 diabetes mellitus

Figure 1 Flow diagram showing the selection of the study population. DPN: Diabetic peripheral neuropathy; NDPN: Non diabetic peripheral neuropathy; PSM: Propensity score matching; T2DM: Type 2 diabetes mellitus.

Figure 2 Receiver operating characteristic curve of free triiodothyronine/free thyroxine for predicting diabetic peripheral neuropathy. The receiver operating characteristic (ROC) curve plotted based on the random forest model evaluates the value of free triiodothyronine/free thyroxine (FT₃/FT₄) in predicting DPN. First, we used age, sex, duration of diabetes, hypertension, smoking, low-density lipoprotein cholesterol, triglycerides, hormglycated, fasting blood glucose, and body mass index to construct the model and generate the ROC curve (labeled as “original”). Then, we included FT₃/FT₄ as an additional feature in the model and generated a new ROC curve (labeled as “FT₃/FT₄”). ROC: Receiver operating characteristic; AUC: Area under the curve; FT₃/FT₄: Free triiodothyronine/free thyroxine ratio.