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Table 6 Sensitivity and Specificity of CSF ADA at a cut-off of 2.0 U/L

From: The dubious value of cerebrospinal fluid adenosine deaminase measurement for the diagnosis of tuberculous meningitis

ADA

2.0 U/L

Youden index

0.636

True positive (n)

79

True negative (n)

1086

False positive (n)

312

False negative (n)

13

Sensitivity (%)

85.9

95% confidence interval

77.0–92.3

Specificity (%)

77.7

95% confidence interval

75.4–79.8

Positive likelihood ratio

3.85

Negative likelihood ratio

0.18