Table 1.
Distributions of monthly total TB notifications, meteorological measurements and air pollution in Hong Kong from 1997 to 2018
| Variable | Mean ± s.d. | Percentiles | ||||
|---|---|---|---|---|---|---|
| P5 | P25 | P50 | P75 | P95 | ||
| Total population (million people/year) | 69.8 ± 274.1 | 65.8 | 67.3 | 69.5 | 72.1 | 74.1 |
| Total TB cases | 477.0 ± 108.5 | 337.2 | 392.5 | 450.5 | 549.3 | 681.7 |
| Meteorology measurements | ||||||
| Mean average temperature (°C) | 23.5 ± 4.7 | 16.1 | 19.1 | 24.8 | 28.0 | 29.2 |
| Mean relative humidity (%) | 78.3 ± 5.6 | 66.0 | 75.0 | 80.0 | 82.0 | 85.0 |
| Mean air pressure (hPa) | 1012.8 ± 5.6 | 1004.4 | 1007.5 | 1013.2 | 1017.7 | 1020.7 |
| Mean wind velocity (m/s) | 22.9 ± 3.9 | 17.1 | 20.2 | 22.7 | 25.8 | 29.2 |
| Total rainfall (mm/month) | 205.2 ± 227.4 | 3.0 | 31.8 | 124.3 | 319.4 | 651.3 |
| Sunshine duration (h/month) | 151.7 ± 48.3 | 76.3 | 116.8 | 148.5 | 187.2 | 226.1 |
| Pollutant concentration | ||||||
| PM2.5 (μg/m3) | 51.0 ± 17.5 | 24.2 | 37.0 | 50.5 | 64.0 | 79.9 |
| PM10 (μg/m3) | 34.0 ± 12.9 | 14.2 | 24.0 | 32.0 | 44.0 | 56.0 |
| SO2 (μg/m3) | 15.3 ± 5.8 | 7.0 | 10.0 | 15.0 | 19.0 | 25.0 |
| NO2 (μg/m3) | 61.2 ± 12.6 | 41.0 | 52.0 | 61.5 | 70.0 | 81.0 |
| CO (mg/m3) | 0.9 ± 0.2 | 0.6 | 0.7 | 0.8 | 1.0 | 1.2 |
| NOX (μg/m3) | 148.4 ± 39.0 | 33.9 | 127.0 | 151.0 | 171.5 | 230.7 |
s.d., standard deviation.
Note: P5, P25, P50, P75 and P95 are the 5th, 25th, 50th, 75th and 95th percentiles of the variables, respectively.