Table 2 Summary statistics of the daily counts of doctors' house calls, daily concentrations of air pollutants and other environmental data (2000–3).
| Variable (unit) | Missing values (n) | Mean (SD) | Median | Q1–Q3 | Minimum | Maximum |
|---|---|---|---|---|---|---|
| URD | 0 | 51.23 (31.31) | 45 | 30–65 | 5 | 276 |
| LRD | 0 | 36.23 (30.42) | 29 | 16–47 | 1 | 262 |
| Asthma | 0 | 5.49 (3.13) | 5 | 3–7 | 0 | 21 |
| NO2 (μg/m3) | 0 | 44.4 (14.92) | 43.6 | 33.7–53.2 | 12.3 | 132.8 |
| PM2.5 (μg/m3) | 76 | 14.7 (7.34) | 12.9 | 9.5–18.2 | 3.0 | 69.6 |
| PM10 (μg/m3) | 0 | 23.0 (9.87) | 21.0 | 16.2–27.7 | 6.3 | 97.3 |
| Minimal temperature (°C) | 0 | 9.3 (5.53) | 9.4 | 9.4–13.5 | −7.4 | 25.7 |
| Maximal temperature (°C) | 0 | 16.3 (7.42) | 16.0 | 16.0–21.5 | −4.9 | 39.3 |
| Minimal humidity (%) | 0 | 53.3 (16.83) | 51.0 | 51–66 | 17.0 | 94.0 |
NO2, nitrogen dioxide; LRD, lower respiratory disease; URD, upper respiratory disease.