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Table 2 Exposure characteristics on the day of the lung function test (lag 0), and one and two days before (lag 1 and 2)

From: Short-term air pollution exposure decreases lung function: a repeated measures study in healthy adults

Exposure, μg/m3 Average ± sd Min Q1 Q3 Max IQR
PM10
 Same-day (lag 0) 24.9 ± 15.5 5 15 30 105 15
 One day before (lag 1) 24.3 ± 15.6 5 14 29 129 15
 Two days before (lag 2) 23.9 ± 15.4 5 14 27 129 13
NO2
 Same-day (lag 0) 23.1 ± 9.6 7 16 29 65 13
 One day before (lag 1) 21.2 ± 10.0 3 14 27 65 13
 Two days before (lag 2) 20.0 ± 10.1 3 12 25 65 13
O3 – warm season
 Same-day (lag 0) 44.3 ± 19.0 3 30 58 104 28
 One day before (lag 1) 47.0 ± 18.7 3 34 61 104 27
 Two days before (lag 2) 46.6 ± 19.4 1 33 60 106 27
  1. Values represent average ± standard deviation (SD), minimum (min), 25th percentile (Q1), 75th percentile (Q3), maximum (max) and interquartile range (IQR) concentrations of particulate matter with diameter < 10 μm (PM10), nitrogen dioxide (NO2) and ozone (O3) during the warm season (May–September)