Table 1.
Descriptive statistics for the daily counts of psychiatric emergency visits (PEVs) and air pollutant concentrations (μg/m3)
| Mean | SDa | Min | Max | Median | Q1b | Q3c | Missing days | |
|---|---|---|---|---|---|---|---|---|
| PEV | 27 | 6 | 8 | 50 | 27 | 22 | 31 | 0 (0%) |
| PM10 | 14.2 | 6.6 | 1.8 | 65.6 | 12.9 | 10.0 | 16.7 | 153 (9.5%) |
| NO2 | 19.5 | 11.0 | 2.9 | 98.4 | 17.1 | 11.8 | 24.6 | 32 (2.0%) |
| O3 | 50.3 | 20.0 | 2.8 | 155.0 | 50.2 | 36.5 | 63.8 | 112 (7.0%) |
| Warmer months (April to September) | ||||||||
| PEV | 27 | 6 | 11 | 50 | 27 | 22 | 31 | 0 (0%) |
| PM10 | 13.5 | 5.4 | 2.0 | 60.5 | 12.5 | 10.1 | 15.8 | 7 (0.8%) |
| NO2 | 17.2 | 8.7 | 2.9 | 56.1 | 15.4 | 11.0 | 21.3 | 5 (0.6%) |
| O3 | 57.9 | 18.1 | 10.6 | 155.0 | 57.4 | 45. | 69.7 | 15 (1.8%) |
| Colder months (October to March) | ||||||||
| PEV | 27 | 6 | 8 | 46 | 26 | 22 | 31 | 0 (0%) |
| PM10 | 15.1 | 7.8 | 1.8 | 65.6 | 13.7 | 9.8 | 18.5 | 146 (18.6%) |
| NO2 | 22.0 | 12.6 | 2.9 | 98.4 | 19.4 | 13.0 | 27.9 | 27 (3.4%) |
| O3 | 41.3 | 18.2 | 2.8 | 91.3 | 40.7 | 27.3 | 54.1 | 97 (12.4%) |
aSD Standard deviation, bQ1 1st quartile, cQ3 3rd quartile