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Table 5 The effect of heavy–AD days on PEF values compared to that of non–heavy AD days, in adults with asthma

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

 

Type of heavy–AD definition

 

JMA definition

Daily median level ≥ 0.07 km−1 (using LIDAR)

Hourly level ≥ 0.1 km−1 (using LIDAR)

Hourly level ≥ 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

−1.76a

[−3.30, −0.21]

0.85

[−0.86, 2.57]

−0.18

[−1.61, 1.25]

0.38

[−0.60, 1.36]

Lag 0–1

−1.54a

[−2.84, −0.25]

−0.09

[−1.48, 1.29]

−0.21

[−1.42, 0.99]

0.35

[−0.53, 1.24]

Lag 0–2

−1.05

[−2.21, 0.11]

0.14

[−1.11, 1.38]

0.11

[−0.95, 1.17]

0.40

[−0.44, 1.23]

Lag 0–3

−1.09a

[−2.18, −0.01]

−0.04

[−1.19, 1.11]

0.18

[−0.82, 1.17]

0.11

[−0.70, 0.93]

  1. AD Asian dust, CI confidence interval, JMA Japan Meteorological Agency, LIDAR Light detection and ranging, PEF peak expiratory flow
  2. a < 0.05 versus non-heavy AD days