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Table 1 Characteristics of 72,547 medical out-of-hospital cardiac arrests (OHCA) compared to 1774 traumatic cardiac arrests (TCA) in the Swedish Registry of Cardiopulmonary Resuscitation between 1990 and 2016

From: Traumatic cardiac arrest in Sweden 1990-2016 - a population-based national cohort study

  TCA Number (%) 1774 (100) Medical OHCA Number (%) 72,547 (100) P-value*
Sex
 Male 1385 (78) 49,940 (69) < 0.01
 Missing 45 (3) 1543 (2)  
Age
 Years, mean (SD) 51 (23) 70 (16) < 0.01
 Missing 281 (16) 2177 (3)  
Witnessed by
 Crew 253 (14) 10,277 (14) 0.34
 Bystander 735 (41) 38,863 (54) < 0.01
 None 642 (36) 20,931 (29) < 0.01
 Missing for “None” 144 (8) 2476 (3) < 0.01
CPR before arrival of EMS
 Yes 770 (56a) 31,563 (53a) 0.01
 Missing 31 (2) 1142 (2)  
Initial rhythm
 Shockable 165 (9) 20,361 (28) < 0.01
 Missing 179 (10) 5924 (8) < 0.01
Place of OHCA
 Public or other area 1440 (81) 24,278 (33) < 0.01
 Missing 15 (< 1) 454 (< 1)  
Time intervals in minutes (median)
 Collapse to call b 2 3 < 0.01
 Collapse to start of CPR b 4 5 < 0.01
 Collapse to defibrillation b 12 12 0.82
 Call to arrival of EMS 10 8 < 0.01
Treatment
 Adrenaline 1102 (62) 54,325 (75) < 0.01
 Missing adrenaline 12 (< 1) 442 (< 1)  
 Intubation 812 (46) 32,728 (45) 0.73
 Missing intubation 8 (< 1) 439 (< 1)  
Survival to 30 days 65 (4) 5941 (8) < 0.01
 Missing survival info 10 (1) 829 (1)  
  1. a Percentages based on numbers receiving CPR before EMS arrival /non crew-witnessed cases (TCA = 1377 and medical OHCA = 59,794)
  2. b Times only applicable to witnessed cases
  3. *P-values were assessed with two-sided Chi2 test for dichotomous variables and Students t-test for continuous variables