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Table 3 Interpretation of ROC curves

From: Use of glucometer and fasting blood glucose as screening tools for diabetes mellitus type 2 and glycated haemoglobin as clinical reference in rural community primary care settings of a middle income country

 

VPG (Ref.) vs CBG

HbA1c (Ref.) vs. CBG

HbA1c (Ref.) vs. VPG

Positive state for ROC curve

7.0 mmol/L

7%

7%

No. positive

4

7

7

No. negative

665

634

634

Area under curve

0.898

0.754

0.733

Std.Err.

0.036

0.068

0.104

Asympt. Sig.

0.006

0.021

0.033

95% CI

 Lower bound

 Upper bound

0.827

0.970

0.620

0.888

0.529

0.938

Optimal test result for

5.6

5.03

4.6

Sensitivity

75.0%

85.7%

85.7%

Specificity

100 – 21.2%

100 – 50.0%

100 – 73.8%