Summary statistics for the number of out-of-hospital cardiac arrests as well as meteorological and air pollutant data in Korea, 2012–2016.
| N: 38 928 | Mean (SD) | OHCA | |||||
| Quartiles | IQR | ||||||
| Min | 25% | 50% | 75% | Max | |||
| Number of OHCA incidents | 6.1 (4.1) | 1 | 3 | 5 | 9 | 19 | 6 |
| Meteorological factors | |||||||
| Average temperature (°C) | 12.8 (10.1) | −14.4 | 4.2 | 13.5 | 21.9 | 33.1 | 17.7 |
| High temperature (°C) | 17.4 (10.2) | −10.5 | 8.5 | 18.4 | 26.3 | 38.8 | 17.8 |
| Low temperature (°C) | 8.9 (10.3) | −18.0 | 0.2 | 9.3 | 18.2 | 28.8 | 18.0 |
| Daily range (°C) | 8.4 (3.1) | 2.1 | 6.2 | 8.3 | 10.4 | 22.5 | 4.2 |
| Vapour pressure (hPa) | 11.6 (8.3) | 0 | 4.6 | 9.4 | 17.8 | 38.3 | 13.2 |
| Solar radiation (MJ/m2) | 12.3 (6.9) | 0 | 7.3 | 11.9 | 17.4 | 32.5 | 10.1 |
| Sunshine duration (hour) | 12.0 (1.7) | 9.6 | 10.4 | 11.9 | 13.7 | 14.8 | 3.3 |
| Wind speed (m/s) | 2.6 (1.1) | 0 | 1.9 | 2.5 | 3.2 | 10.3 | 1.3 |
| Daily rain (mm) | 3.1 (10.9) | 0 | 0 | 0 | 0.4 | 266.0 | 0.4 |
| Dew point temperature (°C) | 5.2 (11.8) | −25.9 | −4.2 | 5.8 | 15.6 | 28.2 | 11.4 |
| Humidity (%) | 63.3 (16.8) | 26.4 | 51.1 | 63.8 | 75.5 | 100.0 | 24.4 |
| Daily snow (cm) | 0.2 (1.2) | 0 | 0 | 0 | 6.7 | 25.7 | 6.7 |
| Cloud (1/10) | 4.6 (3.2) | 0 | 1.6 | 4.5 | 7.3 | 10.0 | 5.7 |
| Air pollutants | |||||||
| PM2.5 (µg/m3) | 15.6 (18.5) | 4.0 | 8.0 | 13.0 | 26.0 | 285.0 | 18.0 |
| PM10 (µg/m3) | 43.8 (33.7) | 14.0 | 24.0 | 38.0 | 56.0 | 883.0 | 32.0 |
| O3 (ppb) | 40.5 (20.6) | 9.0 | 27.0 | 38.0 | 52.0 | 143.0 | 25.0 |
| NO2 (ppb) | 20.8 (18.4) | 3.0 | 7.0 | 15.0 | 29.0 | 131.0 | 22.0 |
| SO2 (ppb) | 4.6 (3.3) | 1.7 | 3.0 | 4.0 | 6.0 | 17.0 | 3.0 |
| CO (ppm) | 0.49 (0.30) | 0 | 0.3 | 0.4 | 0.6 | 4.4 | 0.3 |
O3 denotes the 8 hours maximum per time or day.
OHCA, out-of-hospital cardiac arrest; min, minimum; max, maximum; PM, particulate matter; ppb, parts-per-billion; ppm, parts-per-million.