Descriptive analysis of daily asthma emergency room admissions, air pollutants, pollen levels and weather variables, in Madrid during 1995–1998
| Variables | Percentiles | |||||||
| Minimum | P10 | P25 | P50 | P75 | P90 | Maximum | ||
| Asthma | 3.3 (2.8) | 0 | 1 | 1 | 3 | 5 | 7 | 26 |
| PM10 24 h µg·m−3 | 32.1 (12.1) | 11.2 | 20.5 | 24 | 29.1 | 37.1 | 47.5 | 108.6 |
| SO2 24 h µg·m−3 | 23.6 (15.4) | 5 | 9.2 | 12.3 | 18.7 | 31.3 | 43.9 | 121.2 |
| NO2 24 h µg·m−3 | 67.1 (18.0) | 25.8 | 46.5 | 55.2 | 64.3 | 75.7 | 91.8 | 147.5 |
| O3 8 h µg·m−3 | 45.8 (28.2) | 1.9 | 11.4 | 23.6 | 42.6 | 63.7 | 85.4 | 152.8 |
| O. europaea grains·m−3 | 6.3 (27.2) | 0 | 0 | 0 | 0 | 0.6 | 6.3 | 321.2 |
| Plantago sp. grains·m−3 | 4.3 (10.3) | 0 | 0 | 0 | 0.2 | 2.3 | 15.3 | 72.8 |
| Poaceae grains·m−3 | 11.1 (27.7) | 0 | 0 | 0.5 | 2.0 | 6.7 | 27.8 | 237.5 |
| Urticaceae grains·m−3 | 2.1 (2.8) | 0 | 0.2 | 0.3 | 1.0 | 2.8 | 6 | 25.8 |
| Mean temperature °C | 15.0 (7.0) | −0.6 | 6.2 | 9.1 | 14.4 | 20.7 | 24.9 | 31.8 |
| Relative humidity % | 61.6 (16.4) | 22.3 | 40.4 | 48.6 | 60.8 | 74.6 | 85.1 | 100.0 |
Data are presented as mean (sd) unless otherwise stated
PM10: particles with a median aerodynamic diameter of <10 µm
SO2: sulphur dioxide
NO2: nitrogen dioxide
O3: ozone
O. europaea: Olea europaea
Number of days in the study period=1461