Table 1.
Descriptive statistics for daily mean values of respiratory ERV, meteorologic variables, and air pollution variables.
| Variable | No. of valid days | Mean ± SD | Minimum | Maximum | IQR |
|---|---|---|---|---|---|
| Respiratory ERV | 1,036 | 15 ± 10 | 0 | 88 | 12 |
| Air temperature (°C) | 1,036 | 13 ± 11 | −10 | 31 | 18 |
| Relative humidity (%) | 1,036 | 58 ± 22 | 9 | 100 | 37 |
| Air pressure (hPa) | 1,036 | 1,017 ± 10 | 992 | 1,048 | 16 |
| SO2 (μg/m3) | 1,036 | 87 ± 88 | 6 | 600 | 100 |
| NO2 (μg/m3) | 1,036 | 63 ± 38 | 5 | 290 | 40 |
| PM10 (μg/m3) | 1,036 | 120 ± 83 | 10 | 570 | 90 |
| UFP (1/cm3) | 818 | 22,000 ± 9,800 | 5,600 | 76,000 | 11,000 |
| PNCtotal (1/cm3) | 818 | 29,000 ± 10,000 | 7,400 | 87,000 | 12,600 |
| PNC3–10 (1/cm3) | 818 | 3,600 ± 4,400 | 85 | 41,000 | 3,880 |
| PNC10–30 (1/cm3) | 818 | 6,900 ± 3,800 | 1,200 | 30,000 | 4,300 |
| PNC30–50 (1/cm3) | 818 | 4,900 ± 1,800 | 890 | 14,000 | 2,300 |
| PNC50–100 (1/cm3) | 818 | 6,700 ± 2,800 | 630 | 19,000 | 3,600 |
| PNC100–300 (1/cm3) | 818 | 6,300 ± 3,500 | 340 | 21,000 | 4,400 |
| PNC300–1,000 (1/cm3) | 818 | 870 ± 710 | 28 | 4,800 | 830 |
| PSCtotal (μm2/cm3) | 818 | 1,300 ± 800 | 78 | 5,100 | 960 |
| PSC50–100 (μm2/cm3) | 818 | 110 ± 49 | 10 | 330 | 60 |
| PSC100–300 (μm2/cm3) | 818 | 580 ± 350 | 29 | 2,100 | 440 |
| PSC300–1,000 (μm2/cm3) | 818 | 510 ± 430 | 17 | 2,700 | 490 |
Abbreviations: PNCx, particle number concentration in the given (x nm) or total size range (3 nm–1 μm); PSCx, particle surface area concentration in the given (x nm) or total size range (3 nm–1 μm).