Table 1 Daily summary of the number of COPD admissions, meteorological and pollutant data.
| Mean | SD | Min | Q1 | Median | Q3 | Max | |
|---|---|---|---|---|---|---|---|
| Admissions for COPD (n) | 65.3 | 18.9 | 15 | 52 | 65 | 78 | 125 |
| Temperature (°C) | 23.7 | 4.9 | 8.2 | 19.9 | 25.2 | 27.9 | 31.0 |
| Relative humidity (%) | 74.4 | 12.8 | 21.1 | 67.6 | 77.0 | 83.0 | 97.0 |
| NO2 (μg/m3) | 51.2 | 21.8 | 10.1 | 35.0 | 50.1 | 64.0 | 157.6 |
| PM10 (μg/m3) | 50.1 | 23.9 | 13.6 | 31.9 | 44.5 | 64.1 | 172.2 |
| O3 (μg/m3) | 31.0 | 16.2 | 4.8 | 18.1 | 26.7 | 41.0 | 101.3 |
| SO2 (μg/m3) | 15.0 | 11.6 | 0.7 | 7.6 | 12.5 | 19.5 | 99.4 |
| PM2.5 (μg/m3) | 35.7 | 20.6 | 6.0 | 19.4 | 31.7 | 46.7 | 163.2 |
SD, standard deviation; Q1, 25th percentile; Q3, 75th percentile; Min, minimum; Max, maximum; COPD, chronic obstructive pulmonary disease; NO2, nitrogen dioxide; O3, ozone; PM10, PM2.5, particulates with an aerodynamic diameter <10 μm or <2.5 μm; SO2, sulphur dioxide.