Table 2 Descriptive characteristics and univariate analysis of meteorological data.

From: Prediction of emergency department presentations for acute coronary syndrome using a machine learning approach

Meteorological data

Median [Q1–Q3]

Daily number of ED presentations (β (95% CI))

ACS

UA

NSTEMI

STEMI

Mean daily temperature (°C)

10.6 [6.2–15.5]

 − 0.06 (− 0.07– − 0.06)

 − 0.04 (− 0.04– − 0.03)

 − 0.02 (− 0.02– − 0.01)

 − 0.01 (− 0.01– − 0.01)

Maximum daily temperature (°C)

14.6 [9.2–20.0]

 − 0.05 (− 0.06– − 0.05)

 − 0.03 (− 0.03– − 0.03)

 − 0.01 (− 0.01– − 0.01)

 − 0.01 (− 0.01– − 0.01)

Minimum daily temperature (°C)

6.6 [2.3–10.7]

 − 0.08 (− 0.08– − 0.07)

 − 0.04 (− 0.05– − 0.04)

 − 0.02 (− 0.02– − 0.01)

 − 0.01 (− 0.02– − 0.01)

Minimum temperature at 10 cm surface (°C)

4.7 [0.4–8.9]

 − 0.08 (− 0.09– − 0.07)

 − 0.05 (− 0.05– − 0.04)

 − 0.02 (− 0.02– − 0.01)

 − 0.01 (− 0.02– − 0.01)

Daily temperature difference (°C)

0.8 [0.5–1.1]

 − 0.07 (− 0.08– − 0.07)

 − 0.03 (− 0.04– − 0.03)

 − 0.02 (− 0.03– − 0.02)

 − 0.02 (− 0.02– − 0.01)

Daily sunshine duration (h)

4.1 [1.0–7.7]

 − 0.08 (− 0.09– − 0.07)

 − 0.03 (− 0.04– − 0.02)

 − 0.03 (− 0.03– − 0.02

 − 0.02 (− 0.02– − 0.01)

Percentage of daily potential sunshine duration (%)

34 [9–61]

 − 0.08 (− 0.09– − 0.06)

 − 0.04 (− 0.05– − 0.02)

 − 0.02 (− 0.03– − 0.01)

 − 0.02 (− 0.02– − 0.02)

Daily global radiation (J/cm2)

863.0 [323.0–1583.8]

 − 3.77 (− 4.28– − 3.26)

 − 1.45 (− 1.91– − 0.99)

 − 1.51 (− 1.73– − 1.28)

 − 0.81 (− 0.94– − 0.69)

Daily evaporation (mm)

1.3 [0.4–2.5]

 − 0.24 (− 0.27– − 0.21)

 − 0.1 (− 0.13– − 0.07)

 − 0.09 (− 0.11– − 0.08)

 − 0.05 (− 0.06– − 0.04)

Mean daily atmospheric pressure (hPa)

1015.9 [1010.0 − 1021.5]

 − 12.04 (− 12.1– − 11.98)

 − 16.75 (− 16.81– − 16.7)

5.78 (5.75–5.8)

 − 1.06 (− 1.08– − 1.05)

Maximum daily atmospheric pressure (hPa)

1018.7 [1013.1 − 1024.1]

 − 11.32 (− 11.38– − 11.26)

 − 20.29 (− 20.34– − 20.23)

8.79 (8.76–8.81

0.18 (0.16–0.19)

Minimum daily atmospheric pressure (hPa)

1013.0 [1006.5 − 1018.9]

 − 11.87 (− 11.93– − 11.8)

 − 12.89 (− 12.94– − 12.83)

2.99 (2.97–3.02)

 − 1.97 (− 1.99 – − 1.96)

Daily atmospheric pressure difference (hPa)

0.5 [0.3–0.8]

0.03 (0.02–0.04)

 − 0.03 (− 0.04– − 0.02)

0.04 (0.03–0.04)

0.02 (0.02–0.02)

Mean daily atmospheric humidity (%)

82 [74–88]

0.2 (0.2–0.21)

0.08 (0.08–0.09)

0.08 (0.08–0.08)

0.04 (0.04–0.04)

Maximum daily atmospheric humidity (%)

97 [94–98]

 − 0.31 (− 0.31– − 0.3)

 − 0.11 (− 0.12– − 0.11)

 − 0.12 (− 0.12– − 0.12)

 − 0.07 (− 0.07– − 0.07)

Minimum daily atmospheric humidity (%)

63 [52–74]

0.17 (0.16–0.18)

0.08 (0.08–0.09)

0.06 (0.05–0.06)

0.03 (0.03–0.04)

Daily atmospheric humidity difference (hPa)

32 [21–43]

 − 0.21 (− 0.23– − 0.2)

 − 0.1 (− 0.12– − 0.09)

 − 0.07 (− 0.08– − 0.06)

 − 0.04 (− 0.05– − 0.04)

Daily precipitation duration (h)

0.2 [0.0–2.7]

0.08 (0.05–0.1)

0.04 (0.01–0.06)

0.02 (0.01–0.03)

0.02 (0.01–0.02)

Daily amount of precipitation (mm)

0.1 [0.0–2.6]

 − 0.03 (− 0.05– − 0.01)

 − 0.01 (− 0.03–0.0)

 − 0.01 (− 0.02–0.0)

 − 0.01 (− 0.01– − 0.0)

Maximum hourly amount of precipitation (mm)

0.1 [0.0–1.1]

 − 0.18 (− 0.23– − 0.12)

 − 0.07 (− 0.11– − 0.02)

 − 0.06 (− 0.08– − 0.04)

 − 0.05 (− 0.06– − 0.04)

Daily cloud coverage (%)

75 [50–100]

 − 0.55 (− 0.65– − 0.44)

 − 1.82 (− 1.92– − 1.73)

1.0 (0.95–1.05)

0.27 (0.25–0.3)

Mean daily wind speed (m/s)

3.2 [2.4–4.1]

0.19 (0.17–0.21)

0.08 (0.06–0.1)

0.07 (0.06–0.07)

0.05 (0.04 − 0.05)

Maximum daily wind speed (m/s)

5 [4–6]

0.08 (0.07–0.09)

 − 0.0 (− 0.01–0.01)

0.05 (0.05–0.06)

0.03 (0.03–0.03)

Minimum daily wind speed (m/s)

1 [1, 2]

0.25 (0.22–0.29)

0.1 (0.07–0.13)

0.1 (0.08–0.11)

0.05 (0.05–0.06)

Daily maximum wind gust (m/s)

10 [7–12]

 − 0.02 (− 0.03– − 0.02)

 − 0.05 (− 0.06– − 0.05)

0.02 (0.02–0.02)

0.01 (0.01–0.01)

Daily vector average wind direction (degrees)

210 [133–251]

 − 0.05 (− 0.05– − 0.04)

 − 0.04 (− 0.04– − 0.03)

 − 0.01 (− 0.01– − 0.01)

 − 0.0 (− 0.0– − 0.0)

Daily Vector average wind speed (m/s)

2.8 [1.9–3.8]

0.22 (0.2–0.24)

0.1 (0.08–0.11)

0.07 (0.06–0.08)

0.05 (0.04–0.05)

Presentations on the day before

 Number of ACS presentations on the day before

N.A

0.2 (0.19–0.21)

N.A

N.A

N.A

 Number of UA presentations on the day before

N.A

N.A

0.69 (0.67–0.7)

N.A

N.A

 Number of NSTEMI presentations on the day before

N.A

N.A

N.A

0.24 (0.23–0.25)

N.A

 Number of STEMI presentations on the day before

N.A

N.A

N.A

N.A

0.07 (0.06–0.08)

  1. ACS Acute coronary syndrome, CI Confidence Interval, df degrees of freedom, UA unstable angina pectoris, NSTEMI non ST − elevated myocardial infarction, STEMI ST − elevated myocardial infarction, N.A. Not applicable, °C degrees Celsius, h hour, J/cm2 Joule per square centimeter as measure of surface tension, hPa hectopascal, mm millimeters, m/s meter per second.
  2. aCalendar data Day of the week, Month, Season, and Year are analyzed using Kruskal − Wallis test with H − statistics as output. Consequently, post hoc Dunn’s tests with Bonferroni correction were performed with the first category Monday, January, Winter, and 2010 as reference categories.
  3. Bold indicates significance (p < 0.05).
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