Estimation of the effects of heavy Asian dust on respiratory function by definition type

Genes and Environment

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]	3.53^a [0.85, 6.20]	−1.85 [−4.56, 0.86]	0.81 [−0.87, 2.50]
Lag 0–1	−2.72^a [−4.80, −0.53]	2.47^a [0.32, 4.63]	−1.63 [−3.58, 0.33]	0.95 [−0.48, 2.37]
Lag 0–2	−2.26^a [−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	−3.04^a [−4.68, −1.40]	1.25 [−0.50, 3.00]	−1.90^a [−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

ISSN: 1880-7062