Table 1

Baseline characteristics of the patients in relation to whether bystander CPR was performed before the arrival of EMS or not.

Bystander CPR
All patients
(n=11 955)
Yes
(n=8510)
No
(n=3445)
Standardised difference
Year of OHCA 0.01
20112287–19.11620–19.0667–19.4
20122263–18.91640–19.3623–18.1
20132432–20.31696–19.9736–21.4
20142391–20.01675–19.7716–20.8
20152582–21.61879–22.1703–20.4
OHCA during daytime 08:00 – 20:00 (643/293)*7275–66.05363–68.21912–60.70.16
Age (years)72 (52,87)71 (50,87)75 (55,88)0.27
Female sex 3778–31.62615–30.71163–33.80.06
VF/VT as first monitored rhythm (337/91)3456–30.02784–34.1672–20.00.32
OHCA at home (5/2)8430–70.65637–66.32793–81.10.34
Mechanical chest compression(581/293)4188–37.82993–37.71195–37.90.00
Cardiac aetiology (408/142)8070–70.85759–71.12311–70.00.02
Treatment
Adrenalin (103/39)9813–83.16862–81.62951–86.60.14
Intubation (70/32)4345–36.73125–37.01220–35.70.03
Anti-arrythmics (196/86)1893–16.21440–17.3453–13.50.11
Delay (minutes)
Collapse to start of CPR (950/496)4 (0,16)2 (0,12)10 (2,20)1.23
Call for EMS to EMS arrival (1426/626)10 (4,21)10 (4,22)8 (4,17)0.35
  • Results presented as number (%) or median (10th, 90th percentile)

  • *Number of patients with missing information of those receiving and not receiving bystander CPR, respectively.

  • †Standardised difference between the two groups

  • CPR, cardiopulmonary resuscitation; EMS, emergency medical services; ROSC, return of spontaneous circulation; VF/VT, ventricular fibrillation/ventricular tachycardia.