The Ratio of Estimated Average Glucose to Fasting Plasma Glucose Level Is Superior to Glycated Albumin, Hemoglobin A1c, Fructosamine, and GA/A1c Ratio for Assessing β-Cell Function in Childhood Diabetes

Table 4

Estimated cutoff point for C-peptide level to differentiate T1DM from T2DM using a ROC curve in childhood diabetes.

Cutoffs for C-peptide levels (ng/mL)	Area under ROC curve by GA/A1c ratio
	AUC	95% confidence interval	P values
0.1	0.674	0.556–0.791	0.022
0.2	0.675	0.555–0.795	0.021
0.3	0.685	0.565–0.804	0.012
0.6	0.757	0.645–0.868	<0.001
1.0	0.826	0.722–0.918	<0.001
1.5	0.805	0.693–0.920	<0.001
1.8	0.779	0.652–0.905	<0.001
2.0	0.778	0.651–0.903	<0.001
2.5	0.691	0.625–0.889	<0.001