Table 3.
Descriptive summary of baseline meteorological factors and air pollutants in neversmoking asthmatics.
| Overall | Spring (March, April, May) |
Summer (June, July, August) |
Fall (September, October, November) |
Winter (December, January, February) |
p-Value * | |
|---|---|---|---|---|---|---|
| Median (IQR) | Median (IQR) | Median (IQR) | Median (IQR) | Median (IQR) | ||
| Meteorological factor | ||||||
| Temperature (°C) | 14.0 (4.2~21.4) | 11.1 (6.7~15.6) | 23.2 (21.4~25.2) | 16.2 (11.9~20.5) | 0.2 (−3.7~3.9) | p < 0.001 |
| Relative humidity (%)) | 66.4 (54.3~77.1) | 61.2 (50.7~70.7) | 80.0 (70.2~86.7) | 65.7 (55.8~73.3) | 58.2 (46.8~70.4) | p < 0.001 |
| Air pollutant | ||||||
| SO2 (ppb) | 5.8 (4.2~8.0) | 6.4 (4.7~8.3) | 4.5 (3.2~5.9) | 5.3 (4.1~6.8) | 7.9 (6.1~10.8) | p < 0.001 |
| PM10 (μg/m3) | 53.3 (36.0~75.8) | 62.3 (45.5~83.7) | 44.2 (27.0~61.1) | 48.7 (32.3~64.8) | 59.5 (45.5~84.5) | p < 0.001 |
| NO2 (ppb) | 36.4 (26.0~46.8) | 39.2 (28.6~48.6) | 30.1 (22.5~39.4) | 36.3 (27.0~46.1) | 41.0 (29.0~53.7) | p < 0.001 |
| CO (0.1 ppm) | 5.6 (4.1~7.8) | 5.6 (4.4~7.2) | 4.3 (3.6~5.7) | 5.4 (4.0~7.6) | 7.8 (5.7~11.1) | p < 0.001 |
| O3 (ppb) | 18.0 (10.7~26.7) | 25.0 (18.0~31.9) | 22.8 (14.7~31.9) | 16.2 (11.9~20.5) | 10.2 (6.3~15.2) | p < 0.001 |
* p-value from Kruskal–Wallis test for evaluation difference of distributions among four seasons. PM10: particulate matters with a diameter of less than 10 micrometers