Table 1 Data for ambient air pollutants, weather conditions, and COPD-related deaths in Chengdu from 2015 to 2018
| Â | Mean | SD | Min. | 25% | 50% | 75% | Max. | IQR |
|---|---|---|---|---|---|---|---|---|
PM2.5 (μg/m3) | 58.7 | 38.9 | 8.0 | 31.0 | 47.0 | 74.0 | 254.0 | 43.0 |
SO2 (μg/m3) | 14.5 | 6.3 | 4.0 | 10.0 | 14.0 | 18.0 | 41.0 | 8.0 |
NO2 (μg/m3) | 40.5 | 13.1 | 13.0 | 31.0 | 38.0 | 49.0 | 92.0 | 18.0 |
CO (mg/m3) | 0.9 | 0.3 | 0.4 | 0.7 | 0.9 | 1.1 | 2.2 | 0.4 |
O3-8h (μg/m3) | 98.8 | 51.8 | 11.0 | 59.0 | 88.0 | 137.0 | 279.0 | 78.0 |
Temperature (°C) | 16.7 | 7.3 | − 1.9 | 9.9 | 17.3 | 23.0 | 29.8 | 13.1 |
RH (%) | 80.8 | 8.9 | 41.0 | 75.0 | 81.0 | 88.0 | 99.0 | 13.0 |
COPD-related deaths | 41.8 | 14.9 | 14.0 | 32.0 | 38.0 | 49.0 | 114.0 | 17.0 |
Age group (year) | ||||||||
 60–69 | 4.5 | 2.5 | 0 | 3.0 | 4.0 | 6.0 | 16.0 | 3.0 |
 70–79 | 11.6 | 5.0 | 1.0 | 8.0 | 11.0 | 14.0 | 37.0 | 6.0 |
 80–89 | 19.0 | 7.5 | 4.0 | 14.0 | 18.0 | 23.0 | 60.0 | 9.0 |
 ≥ 90 | 6.7 | 3.5 | 0 | 4.0 | 6.0 | 9.0 | 22.0 | 5.0 |
Gender | ||||||||
 Male | 23.1 | 8.8 | 7.0 | 17.0 | 21.0 | 27.0 | 62.0 | 10.0 |
 Female | 18.7 | 7.5 | 4.0 | 13.0 | 17.0 | 23.0 | 61.0 | 10.0 |
Marital status | ||||||||
 Married | 21.9 | 8.4 | 5.0 | 16.0 | 20.0 | 26.0 | 62.0 | 10.0 |
 Alternative statuses a | 19.9 | 7.9 | 4.0 | 14.0 | 19.0 | 24.0 | 55.0 | 10.0 |