Table 1. Clinical characteristics of ILI-outpatients in Shanghai from January 2011 to December 2013.
| Characteristics | Influenza virus-positive | Other virus-positive * | virus-negative | P value | Total# |
|---|---|---|---|---|---|
| n = 393 | n = 245 | n = 1332 | n = 1970 | ||
| Demographics | |||||
| Male | 185(47.1%) | 129(52.7%) | 706(53%) | 0.113 | 1020(51.8%) |
| age(y)(means±SD) | 24.2±18.0 | 17.4±17.8 | 18.8±16.1 | <0.001 | 19.7±16.9 |
| Clinical | |||||
| Presentation | |||||
| Temperature(°C)≥39°C | 79(20.2% of 391) | 23(9.4% of 245) | 79(5.9% of 1329) | <0.001 | 262(13.3% of 1965) |
| Cough | 320(81.4%) | 174(71.0%) | 843(63.3%) | <0.001 | 1337(67.9%) |
| Sore throat | 214(54.5%) | 133(54.3%) | 658(49.4%) | 0.117 | 1005(51.0%) |
| Running rose | 200(50.9%) | 109(44.5%) | 489(35.7%) | <0.001 | 798(40.5%) |
| Headache | 139(35.4%) | 60(24.5%) | 357(26.8%) | 0.002 | 556(28.2%) |
| Fatigue | 161(41.0%) | 67(27.3%) | 410(30.8%) | <0.001 | 638(32.4%) |
| Interval (days) | 1(0–1) | 1(0–1) | 1(0–1) | 0.605 | 1(0–1) |
| Routine examination | |||||
| White cell count(×109/l) | 8.84±11.97(n = 358) | 8.49±5.20(n = 219) | 8.27±7.15(n = 1213) | 0.496 | 8.41±8.16(n = 1790) |
| Percentage of neutrophis(%) | 60.81±18.91(n = 351) | 59.4±18.47(n = 216) | 59.4±18.12(n = 1192) | 0.439 | 59.7±18.32(n = 1759) |
| Percentage of lymphocytes (%) | 25.5±22.7(n = 339) | 29.1±20.0(n = 211) | 28.5±19.6(n = 1162) | 0.038 | 27.9±20.3(n = 1712) |
Values are mean with SD or n (%) of outpatients unless otherwise stated. Normally distributed data are reported as means with SD and non-normally distributed data as medians with inter quartile range.
The characteristics contain demography characteristic, presenting symptoms, and clinical findings.
*Positive cases for at least one respiratory virus except Influenza viruses by RT-PCR.
# Include all ILI cases regardless of virology RT-PCR test results.
Boldface font indicates statistical.