Table 2

Poisson regression estimates measuring the association between visits to the emergency department for asthma exacerbation and various meteorological pollen, virus and fine particles

ParameterSEP value
Baseline1.40.2<10−4
ωBaseline 0.370.130.005
PM2.5: E50 (µg/m3)13.55.40.012
PM2.5: Emax+139.00%0.2<10−4
Precipitations (mm)+0.02%0.0140.99
Temperature (°C)0.00%0.00390.99
Atmospheric pressure (hPa)0.00%0.000330.99
Wind speed (m/s)−0.31%0.0170.85
Relative humidity (%)+1.19%0.0026<10−4
Total pollen taxa (g/m³)0.00%0.000110.97
Respiratory syncytial virus (RSV) (n)+1.30%0.00091<10−4
Public holidays−92.80%0.081<10−4
  • Notes:Parameter estimates refer to percentage change on daily asthma exacerbation visit number for one-unit increase of continuous variables (ie, precipitations, temperature, atmospheric pressure, wind speed, relative humidity, total pollen taxa, RSV). ωBaseline stands for the SD of intergeographical area variability. Emax is the maximum percentage change on daily asthma exacerbation visit number associated with PM2.5 concentrations. E50 stands for the PM2.5 concentration value to reach 50% of the maximum percentage change. PM2.5, fine particulate matter with an aerodynamic diameter smaller than 2.5 µm.