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Table 1 The mean ADA activity (with range) in the CSF of TBM patients (n = 117), non-TBM infectious meningitis patients (n = 60) and control patients with non-infectious neurological disorders (n = 104). The data are expressed as mean ± SD

From: Cerebrospinal fluid adenosine deaminase activity: A complimentary tool in the early diagnosis of tuberculous meningitis

Patient groups ADA activity (U/L/min) Mean ± SD Range
1. Tuberculous Meningitis (n = 117) 14.31 ± 3.87 2.99–26.94
   Culture positive (n = 27) 17.67 ± 4.18 9.01–26.94
   Clinically suspected (n = 90) 13.29 ± 3.16 2.99–21.02
2. Non TBM infectious meningitis (n = 60) 9.25 ± 2.14 4.99–13.96
   Pyogenic meningitis (n = 41) 10.11 ± 1.99 5.11–13.96
   Viral meningitis (n = 19) 7.39 ± 0.93 4.99–9.00
3. Non-infectious neurological disorders (n = 104) 2.71 ± 1.96 0.00–7.68
   Headache (n = 32) 0.98 ± 0.19 0.11–1.20
   Stroke (n = 29) 4.18 ± 1.19 1.92–5.83
   Venous sinus thrombosis (n = 13) 1.82–4.12  
   Guillian-Barré syndrome (n = 12) 5.38 ± 2.16 2.63–7.68
   Epilepsy (n = 6) 2.36 ± 0.79 1.01–3.18
   Other neurological disorders (n = 12) 1.18 ± 0.47 0.5–1.87