Table 5—

Relations between lung function and carbon monoxide level on the previous day(lag 1) in bi-pollutant and multi-pollutant models#

β±semp-valueChange per 1 mg·m−3 CO %
Morning PEF
 None-8.50±3.540.02-2.60
 SO2-8.23±3.410.02-2.52
 PM10-10.52±4.180.01-3.22
 NO2-8.64±3.520.01-2.64
 All pollutants-10.70±4.150.01-3.27
Evening PEF
 None-9.17±4.220.03-2.72
 SO2-8.53±4.240.04-2.53
 PM10-9.28±4.910.06-2.76
 NO2-9.56±4.620.04-2.84
 All pollutants-9.18±4.890.06-2.72
Morning FEV1
 None-0.03±0.020.22-1.17
 SO2-0.03±0.020.25-1.09
 PM10-0.03±0.030.34-1.17
 NO2-0.03±0.020.21-1.28
 All pollutants-0.03±0.030.34-1.18
Evening FEV1
 None-0.05±0.040.21-1.98
 SO2-0.04±0.040.24-1.77
 PM10-0.05±0.040.20-2.24
 NO2-0.05±0.040.16-2.22
 All pollutants-0.05±0.040.22-2.19
  • β: regression coefficient from generalised estimating equation models for panel data, controlling for temperature, relative humidity, atmospheric pressure, corticosteroid use and smoking habit (changes for 1 mg·m−3 increase in pollutant concentration); PEF: peak expiratory flow; PM10: particles with a 50% cut-off aerodynamic diameter of 10 μm; FEV1: forced expiratory volume in 1 s. Bold values represent significant results. #: after adjustment for the various pollutants indicated.