I want to create a confusion matrix based on gold standard HbA1c, cut-off values of HbA1C = <5.7= Normal, 5.7-6.4 = Pre-diabetes and >/= 6.5 = Diabetes. Similarly cut-off values for FBG is FBG= <100 = prediabetes, 100-125= Prediabetes and >/= 126= Diabetes. I want to check for diabetes and normal and than prediabetes and normal for sensitivity and specificity