Table 2.
Descriptive statistics of exposure variables.
| Exposure variables | Minimum | 25th percentile | Median | 75th percentile | Maximum | Mean ± SD |
|---|---|---|---|---|---|---|
| Air pollution variables | ||||||
| PM2.5 (μg/m3) | 16.04 | 17.65 | 18.29 | 19.08 | 21.45 | 18.39 ± 1.05 |
| PM2.5 absorbance (10–5/m) | 1.01 | 1.37 | 1.52 | 1.72 | 3.39 | 1.58 ± 0.35 |
| PMcoarse (μg/m3) | 0.84 | 9.29 | 10.14 | 11.13 | 15.00 | 10.13 ± 1.53 |
| PM10 (μg/m3) | 23.97 | 26.54 | 27.43 | 28.62 | 34.68 | 27.74 ± 1.84 |
| NO2 (μg/m3) | 19.81 | 26.79 | 29.47 | 32.90 | 62.44 | 30.12 ± 4.85 |
| NOx (μg/m3) | 24.30 | 41.97 | 49.28 | 57.66 | 126.63 | 50.47 ± 11.70 |
| Traffic load at major roads (vehicles × m/day) per 100,000 | 0.00 | 0.00 | 0.00 | 13.50 | 268.19 | 9.54 ± 21.20 |
| Noise variablesa | ||||||
| LDEN [dB(A)] | 0.00 | 46.70 | 52.13 | 60.87 | 84.56 | 53.74 ± 9.49 |
| LNIGHT [dB(A)] | 0.00 | 38.15 | 43.54 | 51.75 | 76.29 | 44.88 ± 9.17 |
| Abbreviations: dB(A), A-weighted decibels; LDEN, weighted 24-hr mean; LNIGHT, night-time mean. aDescriptive statistics for the noise exposures are based on continuous variables, without a threshold. | ||||||