Table 6—

Effects of a increase in 10 µg·m−1 of suspended black particles (BS), suspended particles with an aerodynamic diameter of <13 µm (PM), nitrogen dioxide (NO2) and ozone (O3) levels on prevalent episodes

Lag daysBSPMNO2O3#
Asthma01.10 (0.77–1.57)1.07 (0.72–1.59)1.05 (0.84–1.33)1.03 (0.93–1.13)
0–21.02 (0.50–2.06)1.18 (0.64–2.17)1.01 (0.67–1.52)1.07 (0.84–1.35)
0–41.04 (0.44–2.46)1.16 (0.63–2.13)1.02 (0.61–1.67)1.06 (0.85–1.30)
Nocturnal cough01.08 (0.95–1.25)1.05 (0.83–1.34)1.00 (0.91–1.10)1.04 (0.97–1.10)
0–21.33 (1.03–2.10)*1.10 (0.81–1.50)1.07 (0.95–1.21)1.04 (0.92–1.18)
0–41.15 (0.83–1.61)1.09 (0.79–1.52)1.04 (0.88–1.23)0.95 (0.84–1.07)
Respiratory infections01.57 (1.10–2.23)*1.17 (0.68–2.03)1.39 (1.04–1.86)*1.08 (0.93–1.24)
0–24.68 (1.45–15.1)*1.31 (0.51–3.36)1.88 (0.97–3.64)1.12 (0.85–1.47)
0–42.65 (0.70–10.0)1.71 (0.71–4.12)1.36 (0.59–3.09)1.08 (0.79–1.48)
  • 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