Average change in peak expiratory flow (PEF) and 95% CI associated with an IQR increase on the same day exposure
| Pollutant | Exposure variable | Average change in PEF (L/min) per IQR increase (95% CI) | ||
| All person-days | All-day at home | Not all-day at home | ||
| PM2.5 | PeT | −0.53 (−0.83, 0.23) | −0.56 (−0.94, 0.17) | −0.50 (−0.93, –0.06) |
| PeIG | −0.31 (−0.54, 0.09) | −0.43 (−0.70, 0.15) | −0.04 (−0.41, 0.32) | |
| PeOG | −0.16 (−0.39, 0.06) | 0.051 (−0.60, 0.71) | −0.22 (−0.46, 0.01) | |
| Ambient | −0.07 (−0.45, 0.30) | 0.15 (−0.39, 0.69) | −0.27 (−0.76, 0.23) | |
| NO2 | PeT | 0.58 (0.04, 1.12) | 0.54 (−0.16, 1.25) | 0.57 (−0.08, 1.22) |
| PeIG | 0.14 (−0.24, 0.53) | 0.06 (−0.44, 0.55) | 0.37 (−0.13, 0.87) | |
| PeOG | 0.37 (−0.09, 0.83) | 1.74 (0.75, 2.73) | −0.10 (−0.61, 0.41) | |
| Ambient | 0.20 (−0.41, 0.81) | −0.25 (−1.13, 0.63) | 0.46 (−0.30, 1.23) | |
| CO | PeT | −0.05 (−0.40, 0.31) | −0.18 (−0.68, 0.33) | 0.06 (−0.41, 0.54) |
| PeIG | 0.14 (−0.28, 0.56) | 0.39 (−0.17, 0.94) | −0.00 (−0.60, 0.60) | |
| PeOG | 0.19 (−0.06, 0.45) | 0.43 (−0.21, 1.07) | 0.10 (−0.17, 0.38) | |
| Ambient | −0.20 (−0.55, 0.14) | −0.16 (−0.65, 0.32) | −0.24 (−0.69, 0.20) | |
| O 3 | PeT | −0.35 (−0.91, 0.21) | −0.45 (−1.16, 0.26) | −0.30 (−1.02, 0.43) |
| PeIG | −0.21 (−0.62, 0.21) | −0.17 (−0.70, 0.36) | −0.16 (−0.75, 0.43) | |
| PeOG | −0.05 (−0.57, 0.47) | −0.73 (−1.75, 0.29) | −0.04 (−0.60, 0.52) | |
| Ambient | 0.31 (−0.28, 0.90) | 0.41 (−0.42, 1.23) | 0.24 (−0.53, 1.01) | |
Results were also presented for those who spent all day at home or not. Random intercept models adjusted for age, sex, COPD severity, Index of Multiple Deprivation rank, inhaled corticosteroids medication use, temperature and time. In bold are the statistically significant estimates.
COPD, chronic obstructive pulmonary disease; PeIG, personal exposure to indoor generated pollution; PeOG, personal exposure to outdoor generated pollution; PeT, total personal exposure.