Table 5.
Seasonally stratified analysis of effects of outdoor PM2.5 and temperature on PEF of the current day.
| Variables | Morning PEF | Evening PEF | ||||
|---|---|---|---|---|---|---|
| β | 95%CI | P | β | 95%CI | P | |
| Spring | ||||||
| PM2.5, 10 μg/m3 | 0.53 | (−0.91,1.96) | 0.472 | −0.81 | (−3.11,1.49) | 0.490 |
| Temp., 1 °C | −0.44 | (−1.65,0.77) | 0.477 | −0.46 | (−1.59,0.68) | 0.430 |
| Summer | ||||||
| PM2.5, 10 μg/m3 | −1.77 | (−4.51,0.97) | 0.204 | −1.14 | (−4.11,1.83) | 0.452 |
| Temp.,1 °C | −7.75 | (−21.66,6.16) | 0.275 | 1.66 | (−7.58,10.91) | 0.724 |
| Autumn | ||||||
| PM2.5, 10 μg/m3 | 0.30 | (−0.77,1.37) | 0.585 | 0.62 | (−0.40,1.65) | 0.233 |
| Temp., 1 °C | −1.01 | (−1.88,−0.13) | 0.024 | −0.93 | (−1.89,0.04) | 0.060 |
| Winter | ||||||
| PM2.5, 10 μg/m3 | −0.40 | (−2.08,1.28) | 0.639 | −1.28 | (−2.50,−0.06) | 0.040 |
| Temp., 1 °C | −0.24 | (−2.95,2.48) | 0.865 | 2.07 | (0.34,3.80) | 0.019 |
Generalized estimating equations were adjusted for gender, height, relative humidity. PEF, peak expiratory flow; Temp., daily average temperature; PM2.5, particulate matter <2.5 µm in aerodynamic diameter.