Table 1.
Age distribution of study participants, participants with influenza‐like illness (ILI), and participants with confirmed influenza virus infection
| Age (year) | Participants (% of total) | Person‐years | ILI episodes (% of total) | ILI samples (% of total) | ILI/1000 person‐years | Influenza A virus | Influenza B virus |
|---|---|---|---|---|---|---|---|
| 0–4 | 659 (6·4) | 732·3 | 90 (19·6) | 64 (25·4) | 122·9 | 6 | 13 |
| 5–14 | 1991 (19·3) | 2233·4 | 140 (30·5) | 65 (25·8) | 62·7 | 8 | 20 |
| 15–29 | 3384 (32·7) | 3756·3 | 92 (20·0) | 50 (19·8) | 24·5 | 6 | 6 |
| 30–44 | 2013 (19·5) | 2247·2 | 57 (12·4) | 34 (13·5) | 25·4 | 0 | 13 |
| 45–59 | 1399 (13·5) | 1593·5 | 50 (10·9) | 23 (9·1) | 31·4 | 2 | 7 |
| 60+ | 895 (8·7) | 1006·8 | 30 (6·5) | 16 (6·3) | 29·8 | 3 | 3 |
| Total | 10 341 (100·0) | 11 569·5 | 459 (100·0) | 252 (100·0) | 39·8 | 25 | 62 |