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Table 2 Characteristics of cases and controls

From: An automated CPR device compared with standard chest compressions for out-of-hospital resuscitation

Characteristics   A-CPR C-CPR P Value
  n = 66 n = 220
Age median [IQR](years) 69 [53–78] 71 [55–77.5] 0.53*
Gender Male n(%)   36 (55) 135 (61) 0.32#
Bystander CPR n(%)   33 (54) 127 (62) 0.25#
Initial Rhythm     
  Asystole n(%) 29 (44) 88 (40) 0.50^
  VF/VT n(%) 20 (30) 78 (36)
  PEA n(%) 8 (12) 28 (13)
  Other n(%) 8 (12) 26 (11)
  unknown n(%) 1 (2) 0
Witnessed status     
  Witnessed n(%) 39 (59) 133 (60) 0.98#
  Witnessed by EMS n(%) 8 (12) 26 (12)
  Not witnessed n(%) 19 (29) 61 (28)
Precipitating Event     
  Presumed cardiac n(%) 57 (86) 211 (96) 0.02^
  Respiratory n(%) 5 (7) 6 (3)
  Neurological n(%) 1 (2) 0
  Overdose n(%) 2 (3) 3 (1)
  Hanging n(%) 1 (2) 0
EMS Response time median [IQR] 9 [713] 9 [713] 0.73*
Time from arrival to A-CPR activation 4 [27] NA  
Overall survival to hospital n(%) 17 (26) 43 (20) 0.23#
Overall survival to hospital discharge n(%) 2 (3) 15 (7) 0.38^
  1. IQR: Inter-quartile range; NA: Not Applicable *Mann–Whitney test; #Chi Squared test; ^Fischer’s exact test.