Table 3. Descriptive statistics for variables used in our study (N=424).
| Variables | Mean (SD) | |
|---|---|---|
| PM10 pollution | PM10 observed at the district level (µg/m3) | 46.8 (3.1) |
| PM10 interpolated at the sub-district level (µg/m3) | 46.7 (0.9) | |
| Weather factors | Temperature (℃; annual average) | 12.3 (0.7) |
| Wind speed (m/sec; annual average) | 1.7 (0.3) | |
| Precipitation (cm; annual average) | 185 (15.3) | |
| Socioeconomic factors | Average land value (KRW/m2) | 3.7 million (2.6 million) |
| % households relying on welfare subsidy | 3.6 (2.9) | |
| % household heads with college education | 47.5 (11.1) | |
| Apartment rate (%) | 52.1 (30.6) | |
| Population density (person/km2) | 25,498 (13,728) | |
| Number of clinics and hospitals within the sub-district | 38.3 (53.2) |