Table 3.
Screening and confirmatory models: Variables and scores
| Variable | Correlation coefficient (P) | B coefficient | SE | Exp (B) (95% CI) | Score |
|---|---|---|---|---|---|
| Screening model | |||||
| Conjunctival suffusion | 0.057 (0.047)* | 0.15 | 0.17 | 1.16 (0.83-1.62) | 2 |
| Calf tenderness with or without myalgia | 0.093 (0.001)** | 0.78 | 0.24 | 2.19 (1.38-3.50) | 8 |
| Raised serum creatinine | 0.122 (0.000)** | 0.51 | 0.13 | 1.67 (1.30-2.14) | 5 |
| Consider one of the 3 | |||||
| Headache with conjunctival suffusion OR | 0.064 (0.026)* | 0.05 | 0.27 | 1.05 (0.61-1.79) | 1 |
| Headache with jaundice OR | 0.059 (0.041)* | 0.14 | 0.14 | 1.15 (0.88-1.50) | 1 |
| Headache with both conjunctival suffusion and jaundice | 0.076 (0.008)** | 0.39 | 0.38 | 1.47 (0.70-3.08) | 4 |
| Dyspnea or meningism | 0.020 (0.489) | 1 | |||
| Total | 22 | ||||
| Confirmatory model | |||||
| PCR | 0.629 (0.000)** | 12.01 | 1.35 | 164410 (11734-2303452) | 120 |
| IgM ELISA | 0.298 (0.000)** | 2.37 | 0.71 | 10.73 (2.69-42.84) | 20 |
| MAT | 0.594 (0.000)** | 8.84 | 8.84 | 6905.85 (1255.99-37970.62) | 90 |
| Total | 230 |
*Significant at P<0.05, **Significant at P<0.001. SE: Standard error, CI: Confidence interval, OR: Odds ratio, PCR: Polymerase chain reaction, MAT: Microscopic agglutination test, IgM: Immunoglobulin M