Table 1 Descriptive statistics of daily adult asthma hospitalizations, meteorological variables and air quality in Beijing, China from 2012 to 2015
n (%) | Mean ± SD | Minimum | Percentiles | Maximum | |||
|---|---|---|---|---|---|---|---|
25th | 50th | 75th | |||||
Asthma hospitalizations | |||||||
Total | 18,500 (100) | 12.7 ± 6.1 | 0.0 | 8.0 | 13.0 | 17.0 | 34.0 |
Male | 7522 (40.7) | 5.1 ± 3.0 | 0.0 | 3.0 | 5.0 | 7.0 | 18.0 |
Female | 10,978 (59.3) | 7.5 ± 4.1 | 0.0 | 4.0 | 7.0 | 10.0 | 26.0 |
19–64 years old | 11,079 (59.9) | 7.6 ± 4.0 | 0.0 | 5.0 | 7.0 | 10.0 | 24.0 |
≥ 65 years old | 7421 (40.1) | 5.1 ± 3.2 | 0.0 | 3.0 | 5.0 | 7.0 | 18.0 |
Environmental variables | |||||||
Mean temperature (°C) | / | 12.6 ± 11.3 | − 12.0 | 2.0 | 14.0 | 23.0 | 32.0 |
Minimum temperature (°C) | / | 6.9 ± 11.4 | − 18.0 | − 3.0 | 8.0 | 18.0 | 27.0 |
Maximum temperature (°C) | / | 18.6 ± 11.6 | − 7.0 | 7.0 | 21.0 | 29.0 | 42.0 |
Mean apparent temperature (°C) | / | 5.5 ± 14.9 | − 34.1 | − 7.8 | 6.2 | 19.1 | 32.7 |
Relative humidity (%) | / | 53.9 ± 20.1 | 8.0 | 38.0 | 54.0 | 70.0 | 98.0 |
Wind speed (m/s) | / | 9.4 ± 4.9 | 3.0 | 6.0 | 8.0 | 11.0 | 34.0 |
Air quality index | / | 115.5 ± 73.1 | 14.0 | 65.0 | 94.0 | 147.0 | 485.0 |