Table 3—

Comparison of the performance of the predictive equation and static capillary plasma glucose cut points

Screening testSensitivity (%)Specificity (%)PPV (%)OAPRTrue positiveFalse positiveFalse negative
Equation6396641.75633637
Capillary plasma glucose
 ≥110 mg/dl8465210.278431516
 ≥120 mg/dl7677270.377620724
 ≥130 mg/dl6387350.546311737
 ≥140 mg/dl5592430.76557245
 ≥150 mg/dl5095531.11504550
 ≥160 mg/dl4496551.22443656
 ≥170 mg/dl4297601.56422758
 ≥180 mg/dl3998682.17391861
  • True positive = new cases = prevalence × sensitivity × n; false positive = 1 − prevalence × 1 − specificity × n; false negative = missed cases = prevalence × 1-sensitivity × n, where prevalence of undiagnosed diabetes is 10% and n = 1,000.