Table 1. Demographical characteristics and symptoms.
| Characteristics | Years | 2012 | 2013 | 2014 | 2015 | Total |
|---|---|---|---|---|---|---|
| (N = 1212) | (N = 1520) | (N = 1930) | (N = 676) | (N = 5338) | ||
| Gender no. (%) | ||||||
| Male | 609 (50.3) | 745 (49.0) | 936 (48.5) | 344 (50.9) | 2634 (49.3) | |
| Female | 587 (48.4) | 767 (50.5) | 987 (51.1) | 331 (49.0) | 2672 (50.1) | |
| Missing | 16 (1.3) | 8 (0.5) | 7 (0.4) | 1 (0.1) | 32 (0.6) | |
| Age group no. (%) | ||||||
| 0–5 yrs | 748 (61.7) | 759 (49.9) | 941 (48.8) | 355 (52.5) | 2803 (52.5) | |
| 5–10 yrs | 117 (9.7) | 163 (10.7) | 208 (10.8) | 83 (12.3) | 571 (10.7) | |
| 10–15 yrs | 68 (5.6) | 84 (5.5) | 121 (6.3) | 41 (6.1) | 314 (5.9) | |
| 15–25 yrs | 71 (5.9) | 122 (8.0) | 230 (11.9) | 61 (9.0) | 484 (9.1) | |
| 25–50 yrs | 59 (4.9) | 120 (7.9) | 265 (13.7) | 98 (14.5) | 542 (10.2) | |
| 50+ yrs | 19 (1.6) | 18 (1.2) | 83 (4.3) | 22 (3.3) | 142 (2.7) | |
| Missing | 130 (10.7) | 254 (16.7) | 82 (4.2) | 16 (2.4) | 482 (9.0) | |
| Clinical signs no. (%) | ||||||
| Myalgia | 124 (10.2) | 342 (22.5) | 305 (15.8) | 95 (14.1) | 850 (15.9) | |
| Fever | 1197 (98.8) | 1463 (96.2) | 1927 (99.8) | 670 (99.1) | 5257 (98.5) | |
| Cough | 1024 (84.5) | 1299 (85.5) | 1654 (85.7) | 577 (85.3) | 4554 (85.3) | |
| Vomiting | 123 (10.1) | 33 (2.2) | 86 (4.5) | 63 (9.3) | 305 (5.7) | |
| Diarrhea | 93 (7.7) | 30 (2.0) | 44 (2.3) | 12 (1.8) | 179 (3.4) | |
| headache | 124 (10.2) | 183 (12.0) | 264 (13.7) | 95 (14.1) | 850 (15.9) | |
| Dyspnea | 20 (1.7) | 24 (1.6) | 88 (4.6) | 12 (1.8) | 144 (2.7) | |
| Rhinitis | 735 (60.6) | 959 (63.1) | 941 (48.8) | 284 (42.0) | 2919 (54.7) | |
| Pharyngitis | 609 (50.2) | 751 (49.4) | 1009 (52.3) | 307 (45.4) | 2676 (50.1) |