Table 1.
Demographic characteristics of patients with influenza-like illness.
| Parameter | Influenza positive (n = 199) | Influenza negative (n = 195) | P |
|---|---|---|---|
| Sex (male), n (%) | 61 (30.7) | 87 (44.6) | <0.01 |
| Age (years), mean ± SD | 43.4 ± 17.8 | 46.7 ± 19.2 | 0.14 |
| Any comorbidity | 39 (19.6) | 72 (36.9) | <0.01 |
| Influenza vaccination (2012–2013) | 85 (42.7) | 89 (45.6) | 0.6 |
| Time to hospital visit from symptom onset (days), mean ± SD | 1.5 ± 1.4 | 1.5 ± 1.7 | 0.40 |
| Detected virus | |||
| Influenza A virus | 196 (98.5) | ||
| H3N2 | 149 (74.9) | ||
| A(H1N1)pdm09 | 36 (18.1) | ||
| Subtype not determined | 11 (5.5) | ||
| Influenza B virus | 3 (1.5) | ||
| Other respiratory viruses | 62 (31.8) | ||
| Negative | 133 (68.2) |