Table 6.
The effect of heavy–AD days on PEF values compared to that of non–heavy AD days, in school children
| Type of heavy–AD definition | ||||
|---|---|---|---|---|
| JMA definition | Daily median level ≥ 0.07 km−1 (using LIDAR) | Hourly level of LIDAR ≥0.1 km−1 (using LIDAR) | Hourly level of LIDAR ≥0.07 km−1 (using LIDAR) | |
| Lag time (days) | Change in PEF (L/min) [95% CI] |
Change in PEF (L/min) [95% CI] |
Change in PEF (L/min) [95% CI] |
Change in PEF (L/min) [95% CI] |
| Lag 0 | −2.33 [−5.09, 0.44] |
3.53a
[0.85, 6.20] |
−1.85 [−4.56, 0.86] |
0.81 [−0.87, 2.50] |
| Lag 0–1 | −2.72a
[−4.80, −0.53] |
2.47a
[0.32, 4.63] |
−1.63 [−3.58, 0.33] |
0.95 [−0.48, 2.37] |
| Lag 0–2 | −2.26a
[−3.98, −0.53] |
1.69 [−0.15, 3.54] |
−0.98 [−2.64, 0.67] |
1.37 [0.01, 2.73] |
| Lag 0–3 | −3.04a
[−4.68, −1.40] |
1.25 [−0.50, 3.00] |
−1.90a
[−3.50, −0.30] |
1.11 [−0.23, 2.45] |
AD Asian dust, CI confidence interval, JMA Japan Meteorological Agency, LIDAR light detection and ranging, PEF peak expiratory flow
a < 0.05 versus non-heavy-AD days