Descriptive statistics of exercise induced changes and baseline concentrations of lung function variables, meteorological variables during the tests, and mean daily concentrations of air pollution during the study period
| n | Mean | Range | IQR | |
|---|---|---|---|---|
| *Relative humidity; †Particle number concentration in size ranges of 0.01–0.032 μm, 0.032–0.1 μm, 0.1–0.32 μm, 0.32–1.0 μm, 1.0–3.2 μm, and 3.2–10 μm respectively. | ||||
| Interquartile ranges of the lag 0 concentrations of the pollutants (IQR) are presented. Lag 0 is defined as the 24 hour period from the previous day noon to noon of the day of the lung function measurements. | ||||
| ΔFEV1 (%) | 139 | −2.2 | −14.0–12.1 | |
| ΔMMEF (%) | 138 | −6.6 | −48.3–25.1 | |
| ΔAEFV (%) | 139 | −5.7 | −24.3–20.1 | |
| FVC0 (l) | 151 | 2.55 | 1.57–3.71 | |
| FEV1 (l) | 151 | 2.18 | 1.30–3.40 | |
| MMEF (l/s) | 151 | 2.53 | 1.19–5.27 | |
| AEFV (l2/s) | 151 | 6.8 | 2.19–16.49 | |
| Test temperature (°C) | 141 | −1.6 | −24.4–14.0 | |
| Test RH* (%) | 141 | 58.8 | 18.1–88.2 | |
| PM10 (μg/m3) | 85 | 25 | 4–158 | 18 |
| Black smoke (μg/m3) | 85 | 13 | 1–57 | 9 |
| NO2 (μg/m3) | 82 | 28 | 5–78 | 11 |
| CO (mg/m3) | 82 | 0.6 | 0.1–2.8 | 0.32 |
| PNC 0.01–0.03† (n/cm3) | 59 | 28 829 | 6 959–83 879 | 11 673 |
| PNC 0.03–0.1† (n/cm3) | 59 | 14 991 | 3 756–59 464 | 7 813 |
| PNC 0.1–0.3† (n/cm3) | 59 | 1 986 | 383–7 642 | 702 |
| PNC 0.3–1.0† (n/cm3) | 59 | 115 | 25–287 | 39 |
| PNC 1.0–3.2† (n/cm3) | 59 | 3.5 | 0.9–11.9 | 1.61 |
| PNC 3.2–10† (n/cm3) | 59 | 0.5 | 0.2–1.6 | 0.18 |