Table 3.
Unit change in exhaled breath condensate pH and 8-isoprostane (95% CI) per interquartile rangea increase in pollutant concentration at various lags of exposure
| Pollutant | pH | 8-isoprostane (log-transformed) |
|---|---|---|
| Person-days of data available | 217 | 217 |
| Black carbon (daily average)b | ||
| Lag 0 | −0.18 (−0.34, −0.03) | 0.31 (0.02, 0.61) |
| Lag 1 | −0.12 (−0.26, 0.02) | 0.31 (0.14, 0.38) |
| 2-day average | −0.23 (−0.40, −0.07) | 0.46 (0.21, 0.71) |
| 3-day average | −0.23 (−0.43, −0.04) | 0.77 (0.48, 1.1) |
| 4-day average | −0.22 (−0.47, 0.02) | 0.44 (0.11, 0.77) |
| 5-day average | −0.17 (−0.44, 0.09) | 0.09 (−0.24, 0.41) |
| PM2.5 (daily average)b | ||
| Lag 0 | 0.06 (−0.07, 0.18) | 0.05 (−0.15, 0.25) |
| Lag 1 | −0.15 (−0.28, −0.02) | 0.14 (−0.03, 0.31) |
| 2-day average | −0.03 (−0.20, 0.14) | 0.15 (−0.05, 0.34) |
| 3-day average | −0.16 (−0.44, 0.13) | 0.38 (0.11, 0.65) |
| 4-day average | 0.15 (−0.37, 0.66) | −0.10 (−0.53, 0.33) |
| 5-day average | 0.52 (0.04, 0.99) | −0.58 (−0.98, −0.19) |
| NO2 (daily average)b | ||
| Lag 0 | −0.01 (−0.15, 0.13) | 0.32 (0.12, 0.52) |
| Lag 1 | −0.01 (−0.16, 0.14) | 0.35 (0.13, 0.57) |
| 2-day average | −0.06 (−0.22, 0.09) | 0.49 (0.24, 0.83) |
| 3-day average | −0.04 (−0.21, 0.23) | 0.59 (0.33, 0.86) |
| 4-day average | −0.02 (−0.23, 0.20) | 0.59 (0.25, 0.94) |
| 5-day average | 0.09 (−0.18, 0.36) | 0.40 (−0.03, 0.83) |
| O3 (8-hour maximum)c | ||
| Lag 0 | −0.08 (−0.19, 0.03) | −0.24 (−0.42, −0.06) |
| Lag 1 | 0 (−0.16, 0.16) | −0.51 (−0.76, −0.26) |
| 2-day average | −0.08 (−0.22, 0.06) | −0.40 (−0.62, −0.18) |
| 3-day average | −0.04 (−0.21, 0.12) | −0.50 (−0.75, −0.25) |
| 4-day average | −0.06 (−0.24, 0.12) | −0.69 (−0.98, −0.39) |
| 5-day average | −0.08 (−0.30, 0.14) | −0.70 (−1.1, −0.33) |
PM2.5 = fine particulate matter, NO2 = nitrogen dioxide, O3 = ozone.
a
Interquartile ranges of pollutants are 0.81 μg/m3 for black carbon, 9.9 μg/m3 for PM2.5, 3.8 ppb for NO2, and 11.6 ppb for O3.
b
Models combine data from both schools and adjust for school, daily maximum 8-hour average O3, and daily average temperature.
c
Models combine data from both schools and adjust for school, daily average black carbon, and daily average temperature.