Table 3.

Stratified analysis of HbA1c for diagnosing diabetes and prediabetes

	Optimal HbA1c % (mmol/mol) cut-off point	Sensitivity (%)	Specificity (%)	AUC (95% CI)	P value
Diabetes
Gender
Male	5.62 (38)	61.6	83.8	0.776 (0.748 to 0.804)	0.96
Female	5.80 (40)	57.7	88.2	0.777 (0.752 to 0.802)
Age (years)
20–29	5.11 (32)	50	72.2	0.645 (0.567 to 0.723)	0.025
30–39	5.94 (41)	49.5	91.3	0.747 (0.694 to 0.801)	0.888
40–49	5.80 (40)	61	84.4	0.757 (0.717 to 0.797)	0.87
50–59	5.85 (40)	64.6	81.9	0.779 (0.739 to 0.818)	0.388
60+	5.67 (39)	65.7	75.1	0.752 (0.710 to 0.794)
Prediabetes
Gender
Male	5.20 (33)	48.6	69.4	0.612 (0.585 to 0.638)	0.662
Female	5.11(32)	58.6	57.5	0.604 (0.581 to 0.626)
Age (years)
20–29	4.79 (29)	77.7	34	0.562 (0.516 to 0.608)	0.676
30–39	5.16 (33)	51.5	62.6	0.588 (0.552 to 0.624)	0.682
40–49	5.3 (34l)	46.4	68.7	0.568 (0.532 to 0.604)	0.781
50–59	5.25 (34)	58.2	84.9	0.581 (0.539 to 0.624)	0.873
60+	5.11 (32)	69.9	87.1	0.576 (0.532 to 0.620)	0.771

HbA1c presented % (mmol/mol).

AUC, area under the curve; HbA1c, glycated hemoglobin.