Table 5 Value of selected laboratory features in predicting a laboratory-positive diagnosis of dengue in suspected dengue patients during the 2007 outbreak in southern Taiwan
From: Clinical and laboratory predictive markers for acute dengue infection
Laboratory feature | Dengue (+)* | Dengue (−)* | Sensitivity (%) | Specificity (%) | Positive predictive value (%) | Negative predictive value (%) |
|---|---|---|---|---|---|---|
(1) WBC <4000/cmm | 315/376 | 53/114 | 83.8 | 53.5 | 85.6 | 50.0 |
(2) PLT < 150 × 103/cmm | 314/376 | 52/114 | 83.5 | 54.4 | 85.8 | 50.0 |
(3) AST/ALT > 1.5 | 297/338 | 64/96 | 87.9 | 33.3 | 82.3 | 43.8 |
(4) CRP < 20 mg/L | 335/357 | 75/102 | 93.8 | 26.5 | 81.7 | 55.1 |
(5) aPTT > 38 sec | 227/301 | 37/80 | 75.4 | 53.8 | 86.0 | 36.8 |
(1) + (2) | 276/376 | 52/114 | 73.4 | 45.6 | 84.1 | 34.2 |
(1) + (4) | 291/357 | 34/102 | 81.5 | 66.7 | 89.5 | 50.7 |
(1) + (2) + (3) | 228/338 | 38/96 | 67.5 | 60.4 | 85.7 | 34.5 |
(1) + (2) + (4) | 255/357 | 27/102 | 71.4 | 73.5 | 90.4 | 42.4 |
(1) + (2) + (5) | 209/301 | 26/80 | 69.4 | 67.5 | 88.9 | 37 |
(1) + (2) + (3) + (4) | 221/338 | 26/96 | 65.4 | 72.9 | 89.5 | 37.4 |
(1) + (2) + (3) + (4) + (5) | 172/301 | 11/80 | 49.5 | 86.3 | 93.1 | 31.2 |