Table 4.
Clinical features used to distinguish patients with Chikungunya fever from patients with AUFI a.
| Parameter | PPV (%) | NPV (%) | Sens (%) | Spec (%) | Likelihood Ratio (+) | Likelihood Ratio (−) |
|---|---|---|---|---|---|---|
| Wrist arthralgia | 96.1 | 44.4 | 90 | 66.6 | 2.72 | 0.13 |
| Wrist, MCP and knee arthralgia | 98 | 55 | 92.7 | 83.3 | 5.56 | 0.08 |
| Wrist, MCP and knee arthralgia, plus arthritis (or adenopathy) | 98 | 44.4 | 91 | 80 | 4.55 | 0.11 |
| MCP and knee arthralgia plus ≥8 VAS score | 96 | 62.5 | 94.2 | 71.4 | 3.29 | 0.08 |
| Wrist, MCP and knee arthralgia, ≥30 joints involved, arthritis and adenopathy | 96.1 | 66.6 | 94.3 | 75 | 3.77 | 0.07 |
a AUFI, acute undifferentiated febrile illness; PPV, positive predictive value; NPV, negative predictive value; Sens, sensitivity; Spec, specificity; MCP, metacarpophalangeal; VAS, visual analog scale.