Table 5—

The effects of an increase of 10 µg·m−3 in suspended black particles (BS), suspended particles with an aerodynamic diameter of <13 µm (PM), nitrogen dioxide (NO2) and ozone (O3) levels on incident episodes

Lag daysBSPMNO2O3#
Asthma01.24 (0.89–1.73)1.06 (0.61–1.83)1.16 (0.95–1.41)0.99 (0.88–1.12)
0–21.15 (0.72–1.84)1.09 (0.48–2.49)1.17 (0.88–1.41)1.18 (0.81–1.40)
0–41.31 (0.75–2.26)1.07 (0.44–2.65)1.17 (0.87–1.56)1.09 (0.88–1.34)
Nocturnal cough01.22 (0.99–1.51)1.10 (0.88–1.37)1.22 (1.05–1.42)*1.04 (0.92–1.18)
0–21.36 (1.00–1.86)*1.03 (0.77–1.37)1.17 (0.97–1.43)0.94 (0.83–1.06)
0–41.23 (0.85–1.78)1.11 (0.86–1.42)1.13 (0.92–1.40)0.95 (0.84–1.07)
Respiratory infections01.96 (1.35–2.84)*0.64 (0.35–1.15)1.69 (1.28–2.22)*0.97 (0.73–1.37)
0–22.08 (1.03–4.21)*0.74 (0.38–1.43)1.71 (1.01–2.90)*0.97 (0.72–1.30)
0–42.15 (0.78–5.96)0.99 (0.58–1.68)1.57 (0.76–3.24)0.90 (0.68–1.18)
  • Data are presented as odds ratios (95% confidence intervals)

  • Each odds ratio was obtained with a generalised estimating equations logistic model, adjusted for the effects of time trend, day of the week, weather and pollen levels

  • #: models without interaction terms, results of those including interaction terms are given in the text

  • : 0.05<p<0.10

  • *: p<0.05

  • n=82