Table 4.
Multivariate logistic model for isolation positivity*
| Parameter | Odds ratio (95% confidence interval) | P value |
|---|---|---|
| DF or DHF | ||
| DF | 1 (referent) | P = 0.053 |
| DHF | 0.716 (0.510–1.005) | |
| Date of illness for specimen collection | ||
| < = day 4 | 1 (referent) | P < 0.001 |
| > day 4 | 0.318 (0.229–0.440) | |
| Infecting serotype | ||
| DENV-1 | 0.510 (0.243–1.070) | P < 0.001 |
| DENV-2 | 0.430 (0.206–0.898) | |
| DENV-3 | 0.229 (0.106–0.493) | |
| DENV-4 | 1 (referent) | |
| Primary or secondary infection | ||
| Primary | 1 (referent) | P = 0.002 |
| Secondary | 0.386 (0.210–0.711) | |
| Temperature | ||
| < 38.0 °C | 1 (referent) | P = 0.001 |
| > = 38.0 °C | 1.660 (1.230–2.241) | |
| IgM titers | ||
| < 40 | 1 (referent) | P < 0.001 |
| > = 40 | 0.332 (0.231–0.476) | |
| IgG titers | ||
| < 50 | 1 (referent) | P < 0.001 |
| > = 50 | 0.133 (0.095–0.186) | |
| Intercept | P < 0.001 | |
*
DF = dengue fever; DHF = dengue hemorrhagic fever.