Table 2.

Comparison of meteorological and time data between OHCA high-incidence and not high-incidence days in training data of Tokyo.

	High-incidence days	Not high-incidence days	P-value
Sample size-days	852 (29.2%)	2070 (70.8%)	–
Temperature-℃
Mean	7.6 (5.7–11.2)	19.8 (13.6–24.8)	< 0.001
Minimum	4.6 (2.6–8.0)	17.1 (10.4–22.3)	< 0.001
Max	11.1 (8.9–14.8)	22.9 (17.1–28.0)	< 0.001
Diurnal temperature	6.4 (4.8–7.9)	6.0 (4.5–7.4)	< 0.001
Humidity-%
Mean	48.1 (37.5–61.7)	65.2 (54.4–72.8)	< 0.001
Minimum	32.0 (23.0–46.0)	49.5 (37.0–59.0)	< 0.001
Max	67.0 (54.0–82.0)	80.0 (72.0–86.0)	< 0.001
Diurnal	29.0 (21.0–38.0)	28.0 (21.0–36.0)	< 0.001
Air pressure-hPa
Mean	1012 (1006–1016)	1009 (1004–1013)	< 0.001
Minimum	1008 (1003–1013)	1006 (1001–1011)	< 0.001
Max	1015 (1010–1020)	1012 (1007–1016)	< 0.001
Diurnal	6.1 (4.2–9.2)	4.6 (3.3–7.2)	< 0.001
Month	3 (2–11)	7 (5–9)	< 0.001
Day-n(%)
Holidays	200 (26.8)	388 (17.9)	< 0.001
The day before holidays	113 (15.0)	385 (17.7)	0.100
The day after holidays	150 (20.1)	303 (14.0)	< 0.001
New year holidays	45 (6.0%)	2 (0.1%)	< 0.001
Monday	147 (19.7%)	270 (12.4%)	< 0.001
Tuesday	95 (12.7%)	321 (14.8%)	0.185
Wednesday	104 (13.9%)	312 (14.4%)	0.815
Thursday	92 (12.3%)	324 (14.9%)	0.091
Friday	88 (11.8%)	329 (15.2%)	0.028
Saturday	95 (12.7%)	322 (14.8%)	0.175
Sunday	125 (16.8%)	292 (13.5%)	0.031

High-incidence days were defined as the number of OHCA events greater than 75% of the Tokyo training data.

Data are presented as a median and interquartile range for continuous variables.

P-values were calculated using Pearson’s chi-square test or the Mann–Whitney U test.