Table 1.
Summary statistics of daily ILI counts, PM2.5, and weather conditions in Beijing, China, during January 1, 2008 to December 31, 2014 (Q1, Q2 and Q3 denote the 25th, 50th and 75th percentile, respectively)
| Variable | Flu season (October-April) | Non-flu season (May-September) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean ± SD | Minimum | Q1 | Q2 | Q3 | Maximum | Mean ± SD | Minimum | Q1 | Q2 | Q3 | Maximum | |
| Daily ILI counts by age groups | ||||||||||||
| <5 | 695.45(227.78) | 270 | 529 | 673 | 815 | 1717 | 657.45(152.24) | 357 | 539 | 648 | 782 | 1088 |
| 5–14 | 448.38(250.29) | 124 | 311 | 389 | 505 | 2794 | 349.26(86.40) | 153 | 289 | 341 | 406 | 710 |
| 15–24 | 191.29(225.80) | 32 | 90 | 119 | 205 | 2097 | 104.44(25.47) | 44 | 86 | 103 | 120 | 197 |
| 25–59 | 356.89(294.82) | 79 | 179 | 246 | 429 | 1627 | 218.73(63.67) | 78 | 176 | 211 | 260 | 512 |
| 60+ | 71.24(53.97) | 10 | 40 | 54 | 83 | 381 | 51.52(22.86) | 16 | 38 | 48 | 62 | 447 |
| Fine airborne particulate matter (μg/m 3) | ||||||||||||
| PM 2.5 | 100.66(80.86) | 2.92 | 44.50 | 77.62 | 131.00 | 568.00 | 90.14(53.24) | 9.79 | 52.25 | 83.26 | 115.70 | 463.00 |
| Meteorological Measures | ||||||||||||
| Temperature | 7.13(8.87) | −12.50 | −0.90 | 6.35 | 14.72 | 26.60 | 25.09(3.36) | 11.20 | 23.30 | 25.60 | 27.50 | 34.50 |
| Humidity | 47.39(19.82) | 8 | 30 | 46 | 63 | 95 | 59.86(17.63) | 13 | 48 | 63 | 73 | 97 |