Table 2. Proportion of symptoms with respect to influenza status.
| Symptoms | Proportion n/N (%) | P-value | ||
|---|---|---|---|---|
| Overall | Influenza negative | Influenza positive | ||
| Cough | 10006/10864 (92.1) | 7509/8263 (90.9) | 2497/2601 (96.0) | < 0.001* |
| Rhinorrhoea | 9203/10453 (88.0) | 6872/7930 (86.7) | 2331/2523 (92.4) | < 0.001* |
| Asthenia | 6210/8738 (71.1) | 4575/6596 (69.4) | 1635/2142 (76.3) | < 0.001* |
| Headache | 3135/6286 (49.9) | 2167/4623 (46.9) | 968/1663 (58.2) | < 0.001* |
| Sore throat | 2215/6400 (34.6) | 1628/4726 (34.4) | 587/1674 (35.1) | 0.654 |
| Vomitting | 2411/8680 (27.8) | 1913/6606 (29.0) | 498/2074 (24.0) | < 0.001* |
| Arthralgia | 1528/5521 (27.7) | 1052/4095 (25.7) | 476/1426 (33.4) | < 0.001* |
| Noisy breath | 2103/8473 (24.8) | 1746/6448 (27.1) | 357/2025 (17.6) | < 0.001* |
| Myalgia | 1301/5583 (23.3) | 902/4148 (21.7) | 399/1435 (27.8) | < 0.001* |
| Shortness of breath | 1862/8290 (22.5) | 1546/6295 (24.6) | 316/1995 (15.8) | < 0.001* |
| Diarrhoea | 1690/8616 (19.6) | 1428/6591 (21.7) | 262/2025 (12.9) | < 0.001* |
| Conjonctivitis | 1608/8357 (19.2) | 1214/6353 (19.1) | 394/2004 (19.7) | 0.581 |
| Ear pain | 917/6144 (14.9) | 690/4571 (15.1) | 227/1573 (14.4) | 0.539 |
| Skin rash | 707/8024 (8.8) | 596/6096 (9.8) | 111/1928 (5.8) | < 0.001* |