Table 1.
Demographic and clinical characteristics of 6,152 patients who visited the ED because of influenza-like illness during the pandemic flu season
| Cases, n (%) |
|||||
|---|---|---|---|---|---|
| Characteristics | Flu positive 1,235 (20) | Flu negative 4,917 (80) | All cases 6,152 (100) | Odd ratio (95% confidence interval) | P values |
| Male-to-female ratio | 1.36:1 | 1.13:1 | 1.12:1 | 1.2012 (1.06-1.36) | .0047 |
| Fever | 1,193 (97) | 4,273 (87) | 5,466 (89) | 4.28 (3.11-5.89) | <.001∗ |
| Cough | 657 (53) | 1,834 (37) | 2,491 (41) | 1.91 (1.69-2.17) | <.001∗ |
| Sore throat | 697 (56) | 1,917 (39) | 2,614 (42) | 2.03 (1.79-2.30) | <.001∗ |
| Malaise | 246 (20) | 918 (19) | 1,164 (19) | 1.08 (0.93-1.27) | .3194 |
| Fever and sore throat | 673 (54) | 1,628 (33) | 2,301 (37) | 2.42 (2.13-2.75) | <.001∗ |
| Fever and cough | 637 (52) | 1,613 (33) | 2,250 (37) | 2.19 (1.92-2.48) | <.001∗ |
| Fever and cough and sore throat | 352 (29) | 671 (14) | 1,023 (17) | 2.52 (2.18-2.92) | <.001∗ |
| Health professionals | 10 (0.81) | 62 (1) | 72 (1) | 0.63 (0.33-1.25) | .1875 |
| Contacted flu–positive case within 7 days | 352 (29) | 701 (14) | 1,053 (17) | 2.40 (2.07-2.78) | <.001∗ |
| Flu vaccine last year | 37 (3) | 176 (4) | 213 (3) | 0.83 (0.58-1.19) | .3161 |
| Underlying diseases | 146 (12) | 1,229 (25) | 1,375 (22) | 0.40 (0.33-0.48) | <.001∗ |
∗
P < .05.