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Table 2 Qualitative Diagnostic Characteristics of Methanol Content of Suspected Beverages Using Modified CA Method and Gold Standard Gas Chromatography (n = 1221, p < 0.001)

From: Evaluation of methanol content of illegal beverages using GC and an easier modified Chromotropic acid method; a cross sectional study

  Gold standardSensitivity (95% CI)Specificity (95% CI)PPV (95% CI)NPV (95% CI)Accuracy (95% CI)Prevalence (95% CI)
Test Results positivenegative
positive12832100
(97.16–100)
97.07
(95.89–97.99)
80
(73.98–84.91)
100
(100)
97.38
(96.32–98.2)
10.48
(8.82–12.34)
negative01061
 Safe drink
positive12337100
(97.05–100)
96.63
(95.38–97.62)
76.88
(70.78–82.02)
100
(100)
97.86
(95.85–98.2)
10.07
(8.44–11.09)
negative01061