Table 6.
Dose-response relation between SO2 (1 h max lag2) and FEV1 in the Panel 20 study: relative percent variation (RPV) and adjusted FEV1. Sarroch (Sardinia), Italy (January–June 2007).
| SO2 (μg/m3) | FEV1 | Adjusted b | ||
|---|---|---|---|---|
| 1 h max lag2 | RPVa | 90% CI | p-Value | FEV1 (l) |
| <50 (reference category) | 0 | 2.16 | ||
| 50–100 | 0.64 | −0.86; 2.15 | 0.486 | 2.17 |
| 100–200 | −1.38 | −3.10; 0.37 | 0.194 | 2.13 |
| 200+ | −2.49 | −4.27; −0.67 | 0.025 | 2.11 |
a From a multipollutant generalized estimating equation model, adjusted for day of the week, parental education, subject height and weight, gender, passive or active smoking, mould or dampness in the house, recent respiratory infections, history of steroid use for asthma, temperature and relative humidity. We use the term “relative” percent variation (RPV) to indicate the PV referred to SO2 < 50 mg/m3. b Adjusted predicted FEV1 from the model above setting all covariates at the sampling average.