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Table 1 Baseline characteristics of 45,067 cases of OHCA

From: Identifying the relative importance of predictors of survival in out of hospital cardiac arrest: a machine learning study

 

Overall

(n = 45,067)

Age – n (%)

 Mean (SD)

68.3 (17.6)

 Missing

1631 (3.6%)

Sex – n (%)

 Men

30,146 (66.9%)

 Women

14,915 (33.1%)

 Missing

6 (0.0%)

Initial rhythm – n (%)

 Asystole

23,984 (53.2%)

 PEA

6844 (15.2%)

 VF/VT

9800 (21.7%)

 Missing

4439 (9.8%)

Defibrillated before ambulance arrival – n (%)

 Defibrillated before EMS arrival

2338 (5.2%)

 Not defibrillated before EMS arrival

37,784 (83.8%)

 Missing

4945 (11.0%)

Witnessed arrest – n (%)

 Non-Witnessed

14,828 (32.9%)

 Witnessed

29,428 (65.3%)

 Missing

811 (1.8%)

Bystander-CPR – n (%)

 CPR by laymen

21,162 (47.0%)

 CPR by professional

3402 (7.5%)

 No bystander-CPR

16,594 (36.8%)

 Missing

3909 (8.7%)

Place of arrest – n (%)

 Home

30,970 (68.7%)

 Other place

5977 (13.3%)

 Public place

8081 (17.9%)

 Missing

39 (0.1%)

Cause of arrest – n (%)

 Heart disease

28,501 (63.2%)

 Overdose

1293 (2.9%)

 Accident

1168 (2.6%)

 Pulmonary disease

2319 (5.1%)

 Suffocation

1143 (2.5%)

 Suicide

983 (2.2%)

 Drowning

515 (1.1%)

 Other

9145 (20.3%)

Time to 911 call (min)

 Median (IQR)

2.0 (1.0, 6.0)

 Missing

17,941 (39.8%)

Time to CPR (min)

 Median (IQR)

3.0 (0.0, 10.0)

 Missing

8149 (18.1%)

Time to defibrillation (min)

 Median (IQR)

15.0 (9.0, 24.0)

 Missing

31,402 (69.7%)

Time to EMS dispatch

 Median (IQR)

1.0 (0.0, 2.0)

 Missing

4263 (9.5%)

Time to EMS arrival

 Median (IQR)

10.0 (6.0, 15.0)

 Missing

6399 (14.2%)

Defibrillation – n (%)

 Defibrillated

15,390 (34.1%)

 Not defibrillated

27,802 (61.7%)

 Missing

1875 (4.2%)

  1. IQR terquartile range