Changes in lung function parameters with exposures by group
| Exposure | FEV1 (l) | FVC (l) | MMEF (l/s) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pre | Post | Mean difference* | Pre | Post | Mean difference* | Pre | Post | Mean difference* | ||||
| *95% CI in parentheses. | ||||||||||||
| Asthma | ||||||||||||
| Air | 3.13 | 3.17 | 0.04 | (−0.06 to 0.14) | 4.17 | 4.28 | 0.11 | (−0.03 to 0.29) | 2.69 | 2.82 | 0.13 | (−0.02 to 0.27) |
| Sulphur dioxide 200 ppb | 3.23 | 3.25 | 0.03 | (−0.05 to 0.11) | 3.98 | 3.84 | −0.14 | (−0.29 to 0.04) | 2.68 | 2.74 | 0.06 | (−0.06 to 0.17) |
| Sulphuric acid 200 μg/m3 | 3.21 | 3.19 | −0.02 | (−0.06 to 0.03) | 4.01 | 4.04 | 0.03 | (−0.07 to 0.16) | 2.84 | 2.75 | −0.09 | (−0.22 to 0.05) |
| Sulphuric acid 2000 μg/m3 | 3.21 | 3.21 | 0.00 | (−0.10 to 0.09) | 4.04 | 3.90 | −0.14 | (−0.28 to 0.01) | 2.69 | 2.75 | 0.06 | (−0.11 to 0.23) |
| Ammonium bisulphate 200 μg/m3 | 3.17 | 3.18 | 0.02 | (−0.05 to 0.08) | 4.12 | 4.01 | −0.11 | (−0.24 to 0.13) | 2.58 | 2.66 | 0.08 | (−0.06 to 0.22) |
| Ammonium bisulphate 2000 μg/m3 | 3.23 | 3.29 | 0.06 | (−0.02 to 0.14) | 3.97 | 3.94 | −0.03 | (−0.21 to 0.14) | 2.90 | 2.97 | 0.07 | (−0.12 to 0.25) |
| Normal | ||||||||||||
| Air | 3.31 | 3.35 | 0.05 | (−0.01 to 0.11) | 4.14 | 4.22 | 0.08 | (−0.09 to 0.26) | 3.26 | 3.39 | 0.13 | (−0.02 to 0.28) |
| Sulphur dioxide 200 ppb | 3.35 | 3.34 | −0.01 | (−0.10 to 0.08) | 4.21 | 4.09 | −0.12 | (−0.29 to 0.02) | 3.38 | 3.47 | 0.09 | (−0.09 to 0.27) |
| Sulphuric acid 200 μg/m3 | 3.37 | 3.33 | −0.04 | (−0.18 to 0.09) | 3.94 | 4.01 | 0.07 | (−0.11 to 0.23) | 3.32 | 3.39 | 0.07 | (−0.15 to 0.28) |
| Sulphuric acid 2000 μg/m3 | 3.31 | 3.32 | 0.01 | (−0.04 to 0.06) | 4.16 | 3.98 | −0.18 | (−0.32 to 0.10) | 3.36 | 3.31 | −0.04 | (−0.20 to 0.11) |
| Ammonium bisulphate 200 μg/m3 | 3.25 | 3.25 | 0.00 | (−0.09 to 0.08) | 3.98 | 4.02 | 0.04 | (−0.07 to 0.19) | 3.19 | 3.18 | −0.01 | (−0.15 to 0.14) |
| Ammonium bisulphate 2000 μg/m3 | 3.23 | 3.22 | −0.01 | (−0.08 to 0.06) | 4.01 | 4.00 | −0.01 | (−0.24 to 0.03) | 3.10 | 3.03 | −0.07 | (−0.24 to 0.11) |