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Table 2 Area under curve and summary statistics of HbA 1c cut-off of 6.5 nmol/l for all patients, for patients with GFR ≥60 and for patients with GFR <60

From: HbA1c versus oral glucose tolerance test as a method to diagnose diabetes mellitus in vascular surgery patients

Parameters All patients Where GFR ≥ 60 Where GFR < 60
No. 275 201 74
Area under curve (95% CI) 0.73 (0.63, 0.84) 0.71 (0.57, 0.84) 0.78 (0.63, 0.94)
Sensitivity (95% CI) 0.45 (0.28, 0.64) 0.46 (0.26, 0.67) 0.44 (0.14, 0.79)
Specificity (95% CI) 0.90 (0.85, 0.93) 0.92 (0.87, 0.96) 0.83 (0.72, 0.91)
Positive predictive value (95% CI) 0.38 (0.23, 0.54) 0.44 (0.24, 0.65) 0.27 (0.08, 0.55)
Negative predictive value (95% CI) 0.92 (0.88, 0.95) 0.93 (0.88, 0.96) 0.92 (0.81, 0.97)