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Table 1 Standardised differences of patients with traumatic OHCA

From: Epinephrine during resuscitation of traumatic cardiac arrest and increased mortality: a post hoc analysis of prospective observational study

  Before Matching After Matching
Epinephrine no-Epinephrine Standardised Difference Epinephrine no-Epinephrine Standardised Difference
Case 822 208   178 178  
Age, years, median (IQR) 54 (33) 54 (30) 4.4% 55 (30) 54 (31) 2.5%
 missing data 59 (7.2%) 18 (8.7%)       
Sex, male, n (%) 581 (70.7%) 133 (63.9%) 14.4% 124 (70.0%) 109 (61.2%) 17.8%
 missing data 0 (0%) 0 (0%)       
Witness, n (%) 482 (58.8%) 110 (52.9%) 11.9% 102 (57.3%) 90 (50.6%) 13.6%
 missing data 2 (0.2%) 0 (0%)       
Bystander CPR, n (%) 133 (16.3%) 25 (12.1%) 12.1% 26 (14.6%) 18 (10.1%) 13.7%
 missing data 5 (0.6%) 1 (0.5%)       
Signs of life at scene, n (%) 84 (10.2%) 8 (3.9%) 25.0% 12 (6.7%) 6 (3.4%) 15.4%
 missing data 0 (0%) 1 (0.5%)       
Asystole at scene, n (%) 519 (64.4%) 161 (77.4%) 28.9% 132 (74.2%) 143 (80.3%) 14.8%
 missing data 16 (1.9%) 0 (0%)       
Collapsed to CA during transportation, n (%) 97 (12.0%) 12 (5.8%) 21.8% 15 (8.4%) 8 (4.5%) 16.1%
 missing data 11 (1.3%) 1 (0.5%)       
Epinephrine prior to hospital arrival, n (%) 94 (12.2%) 11 (5.5%) 23.8% 15 (8.4%) 10 (5.6%) 11.0%
 missing data 54 (6.6%) 9 (4.3%)       
ROSC prior to hospital arrival, n (%) 23 (2.9%) 15 (7.2%) 20.0% 7 (3.9%) 8 (4.5%) 2.8%
 missing data 19 (2.3%) 0 (0%)       
Signs of life on hospital arrival, n (%) 25 (3.1%) 21 (10.1%) 28.5% 12 (6.7%) 13 (7.3%) 2.2%
 missing data 21 (2.6%) 1 (0.5%)       
Asystole on hospital arrival, n (%) 666 (81.8%) 181 (87.4%) 15.6% 157 (88.2%) 160 (89.9%) 5.4%
 missing data 8 (1.0%) 1 (0.5%)       
Mechanism of Injury, penetrate, n (%) 50 (8.4%) 9 (7.8%) 2.0% 9 (5.1%) 9 (5.1%) 0.0%
 missing data 225 (27.4%) 93 (44.7%)       
Emergency call to ambulance arrival, mins, median (IQR) 7 (4) 7 (4) 0.8% 7 (5) 7 (4) 5.7%
 missing data 59 (7.2%) 18 (8.7%)       
CPR duration before hospital arrival, mins, median (IQR) 21 (11) 22 (10) 20.7% 21 (11) 22 (10) 13.9%
 missing data 59 (7.2%) 18 (8.7%)       
  1. OHCA Out-of-Hospital Cardiac Arrest, CPR Cardiopulmonary Resuscitation, CA Cardiac Arrest, ROSC Return of Spontaneous Circulation