Table 3.
The performance of the NS1 strip and 1997 and 2009 WHO classification schemes in secondary DENV infection, infection with different DENV serotypes, time of clinical presentation, and outcome in terms of hospitalization
| Variable | Total dengue (%)* | Number (%) testing positive | ||
|---|---|---|---|---|
| NS1 (N = 124) | WHO 1997 (N = 147) | WHO 2009 (N = 123) | ||
| Serological status at first visit | ||||
| IgG+ (secondary infection) | 79 (51.3) | 53 (67.1) | 72 (91.1) | 60 (75.9) |
| IgG— (primary infection) | 75 (48.7) | 71 (94.7) | 75 (100) | 63 (84.0) |
| P value† | < 0.001 | 0.014 | 0.234 | |
| DENV serotype | ||||
| DENV-1 | 54 (35.1) | 43 (79.6) | 53 (98.1) | 44 (81.5) |
| DENV-2 | 46 (29.9) | 34 (73.9) | 43 (93.5) | 35 (76.1) |
| DENV-3 | 54 (35.1) | 47 (87.0) | 51 (94.4) | 44 (81.5) |
| P value† | 0.256 | 0.508 | 0.793 | |
| Day of fever | ||||
| 1 | 39 (25.3) | 25 (64.1) | 36 (92.3) | 24 (61.5) |
| 2 | 58 (37.7) | 48 (82.8) | 56 (96.6) | 48 (82.8) |
| 3 | 57 (37.0) | 51 (89.5) | 55 (96.5) | 51 (89.5) |
| P value† | 0.010‡ | 0.551 | 0.004§ | |
| Clinical outcome | ||||
| Hospitalized | 86 (55.8) | 73 (84.9) | 82 (95.3) | 74 (86.0) |
| Not hospitalized | 68 (44.2) | 51 (75.0) | 65 (95.6) | 49 (72.1) |
| P value† | 0.153 | 1.000 | 0.043 | |
*
N = 154.
†
Fisher's exact test.
‡
Day 1 vs. 2, P = 0.054; day 1 vs. 3, P = 0.004; day 2 vs. 3, P = 0.420.
§
Day 1 vs. 2, P = 0.032; day 1 vs. 3, P = 0.002; day 2 vs. 3, P = 0.420.