– Gold standard of Insulin resistance assessment:
Hyperinsulinemic Euglycemic Clamp (HEC), PTG-TP marker returns a sensitivity= 95.7%, specificity= 84,4% and the area under the ROC curve (AUC) = 0.929 for identifying insulin resistance.
– Oral Glucose Tolerance Test (OGTT):
The correlations between the OGTT and photoplethysmography index (PTGi) were: r= – 0.56 (p = 0.003) for glucose and r= – 0.41 (p = 0.04 )for insulin.
– Coronary angiography:
PTGi returns a sensitivity of 86.1% and specificity of 87.1% and the area under the ROC curve ( AUC)= 0.926 for identifying endothelial function.