Table 1. Characteristics of enrolled influenza-like illness (ILI) cases, by medical setting and influenza virus status, n (%).
| Characteristics | Medical setting | Influenza virus | Total (N = 1537) | ||
| Outpatient clinics (N = 1005) | ED (N = 532) | Positive (N = 365) | Negative (N = 1172) | ||
| Gender | |||||
| Male | 565 (56.2) | 302 (56.8) | 213 (58.4) | 654 (55.8) | 867 (56.4) |
| Female | 440 (43.8) | 230 (43.2) | 152 (41.6) | 518 (44.2) | 670 (43.6) |
| Agec , d | |||||
| 0–5 m | 42 (4.2) | 35 (6.6) | 14 (3.8) | 63 (5.4) | 77 (5.0) |
| 6–11 m | 193 (19.2) | 126 (23.7) | 33 (9.0) | 286 (24.4) | 319 (20.8) |
| 12–23 m | 286 (28.5) | 147 (27.6) | 84 (23.0) | 349 (29.8) | 433 (28.2) |
| 24–35 m | 172 (17.1) | 91 (17.1) | 82 (22.5) | 181 (15.4) | 263 (17.1) |
| 36–47 m | 156 (15.5) | 79 (14.8) | 61 (16.7) | 174 (14.8) | 235 (15.3) |
| 48–59 m | 156 (15.5) | 54 (10.2) | 91 (24.9) | 119 (10.2) | 210 (13.7) |
| Districta | |||||
| Municipal district | 817 (84.1) | 441 (85.5) | 300 (85.5) | 958 (84.3) | 1258 (84.6) |
| Suburban county | 154 (15.9) | 75 (14.5) | 51 (14.5) | 178 (15.7) | 229 (15.4) |
| Medical insurance | |||||
| Yes | 595 (59.2) | 304 (57.1) | 198 (54.2) | 701 (59.8) | 899 (58.5) |
| No | 410 (40.8) | 228 (42.9) | 167 (45.8) | 471 (40.2) | 638 (41.5) |
| Total family income prior year (thousand U.S. dollars) | |||||
| <15.9 | 462 (57.7) | 206 (57.7) | 164 (55.8) | 504 (58.3) | 668 (57.7) |
| 15.9–23.8 | 213 (26.6) | 74 (20.7) | 67 (22.8) | 220 (25.5) | 287 (24.8) |
| 23.8–31.7 | 74 (9.2) | 44 (12.3) | 33 (11.2) | 85 (9.8) | 118 (10.2) |
| 31.7–39.7 | 25 (3.1) | 14 (3.9) | 13 (4.4) | 26 (3.0) | 39 (3.4) |
| >39.7 | 27 (3.4) | 19 (5.3) | 17 (5.8) | 29 (3.4) | 46 (4.0) |
| Underlying medical conditionsb , c | 41/948 (4.3) | 38/512 (7.4) | 19/340 (5.6) | 60/1120 (5.4) | 79/1460 (5.4) |
Note:
a
Municipal district refers to seven central urban districts and suburban county refers to five county-level districts in Suzhou;
b
Underlying medical conditions include asthma, chronic pulmonary disease, congenital heart disease, neuromuscular disease, renal dysfunction, blood disorders, immunosuppression, etc;
c
Chi-square P<0.05 for comparison between ILI cases from outpatient clinics and ED;
d
Chi-square P<0.05 for comparison between influenza positive and negative ILI cases.