Table 1 Characteristics of present datasets in 16 Japanese citiesa between June and September from 2015 to 2018.
Dataset | Training dataset | Testing dataset |
|---|---|---|
Year | 2015–2017 | 2018 |
Characteristics of heatstroke patients | ||
Heatstrokes with all cases | ||
Total number of heatstrokes, n | 11349 | 7513 |
Incidence rate (95% CI) between June and September per 100,000 persons | 37.5 (36.8–38.2) | 74.4 (72.7–76.1) |
Heatstrokes of hospital admission (i.e., moderate and severe cases) and death cases | ||
Total number of heatstrokes, n | 3318 | 1981 |
Incidence rate (95% CI) between June and September per 100,000 persons | 11.0 (10.6–11.3) | 19.6 (18.8–20.5) |
Weather information, median (minimum, maximum)b per 12 h | ||
Temperature, °C | 25.52 (10.18–33.58) | 26.27 (16.01–35.17) |
Heat index, °C | 25.86 (10.18–38.76) | 26.91 (16.01–40.93) |
WBGT, °C | 23.72 (9.22–30.56) | 24.13 (13.78–31.31) |
Relative humidity, % | 73.2 (35.15–99.79) | 70.96 (38.51–99.75) |
Precipitation previous 12 h, mm | 0.01 (0–212.78) | 0 (0–391.56) |
Downward solar radiation, kW/m2 | 0.02 (0–0.71) | 0.02 (0–0.69) |
Wind speed, m/s | 2.5 (0.44–11.69) | 2.62 (0.33–14.48) |
Days warned by WBGT guides to prevent heatstrokes in daily life, % | ||
July | ||
Warning (25–28 °C) | 14.8 | 10.1 |
Severe warning (28–31 °C) | 76.0 | 42.7 |
Threat of heat disorder (higher than 31 °C) | 6.0 | 43.1 |
August | ||
Warning (25–28 °C) | 11.2 | 6.9 |
Severe warning (28–31 °C) | 64.2 | 62.7 |
Threat of heat disorder (higher than 31 °C) | 24.5 | 30.2 |
