Table 1 Descriptive statistics of daily incidence of influenza cases, meteorological factors and air pollutants in Ningbo, 2014–2017
Variables | Cases | Mean ± SD | Min | Percentile | Max | ||
|---|---|---|---|---|---|---|---|
25 | 50 | 75 | |||||
Influenza | Â | Â | Â | Â | Â | Â | Â |
 Total | 15,312 | 10.48 ± 16.99 | 0 | 1 | 4 | 12 | 119 |
Gender | Â | Â | Â | Â | Â | Â | Â |
 Male | 7445 | 5.10 ± 8.34 | 0 | 0 | 2 | 6 | 68 |
 Female | 7867 | 5.39 ± 8.99 | 0 | 0 | 2 | 6 | 62 |
Age | Â | Â | Â | Â | Â | Â | Â |
 0–6 | 4233 | 2.90 ± 4.73 | 0 | 0 | 1 | 4 | 32 |
 7–17 | 3248 | 2.22 ± 5.36 | 0 | 0 | 0 | 2 | 50 |
 18–64 | 6453 | 4.42 ± 8.60 | 0 | 0 | 2 | 5 | 66 |
 ≥ 65 | 1378 | 0.94 ± 2.18 | 0 | 0 | 0 | 1 | 22 |
Tmean (°C) | – | 17.47 ± 8.41 | − 4.5 | 10.1 | 18.5 | 24.2 | 32.9 |
Pmean (hPa) | – | 1016.01 ± 8.83 | 985.7 | 1008.6 | 1015.7 | 1023.1 | 1039.7 |
Rhmean (%) | – | 79.75 ± 11.18 | 34 | 73 | 81 | 88 | 100 |
O3 (μg/m3) | – | 95.52 ± 40.77 | 6 | 66 | 91 | 121 | 242 |
PM2.5 (μg/m3) | – | 41.61 ± 25.63 | 4 | 24 | 36 | 53 | 219 |
PM10 (μg/m3) | – | 65.94 ± 37.16 | 7 | 39 | 57 | 82 | 282 |
NO2 (μg/m3) | – | 40.39 ± 17.6 | 7 | 28 | 38 | 52 | 122 |