Table 6.
Percent changes in FEV1 and PEF associated with per incremental increases in inhaled doses
| Time points | FEV1 (%) | PEF (%) | ||||
|---|---|---|---|---|---|---|
| PM2.5 | BC | CO | PM2.5 | BC | CO | |
| During exposure 1 h | −0.11 (−0.21, −0.01)* | −0.14 (−0.25, −0.02)* | −0.07 (−0.13, −0.01)* | −0.08 (−0.18, 0.02) | −0.15 (−0.27, −0.03)* | −0.06 (−0.12, 0.01) |
| During exposure 2 h | −0.23 (−0.36, −0.10)* | −0.23 (−0.38, −0.08)* | −0.16 (−0.24, −0.07)* | −0.14 (−0.28, −0.01)* | −0.23 (−0.38, −0.08)* | −0.12 (−0.21, −0.03)* |
| Post-exposure 5 h | 0.13 (−0.02, 0.30) | 0.07 (−0.13, 0.26) | 0.07 (−0.04, 0.17) | −0.01 (−0.18, 0.17) | −0.09 (−0.30, 0.12) | 0.07 (−0.04, 0.17) |
| Post-exposure 7 h | 0.10 (−0.07, 0.27) | 0.07 (−0.12, 0.27) | 0.11 (−0.02, 0.23) | −0.11 (−0.32, 0.10) | −0.15 (−0.40, 0.11) | 0.03 (−0.11, 0.17) |
| Post-exposure 9 h | 0.03 (−0.13, 0.18) | −0.08 (−0.26, 0.10) | 0.04 (−0.06, 0.14) | 0.01 (−0.18, 0.19) | −0.05 (−0.28, 0.17) | 0.09 (−0.03, 0.21) |
| Post-exposure 22 h | 0.01 (−0.20, 0.21) | −0.11 (−0.35, 0.13) | 0.02 (−0.11, 0.16) | 0.03 (−0.16, 0.22) | −0.01 (−0.24, 0.22) | 0.10 (−0.02, 0.22) |
Percent changes and 95 % CIs were both presented. Increases inhaled doses for each pollutant were PM2.5: per 10 μg/m2; BC, per 1 μg/m2; CO, per 0.1 mg/m2
* P < 0.05