Group 1: No CPR prior to call | Copenhagen (NÂ =Â 200) | Stockholm (NÂ =Â 200) | Oslo (NÂ =Â 200) |
 Age (years) median [IQR] | 72 [62;82] | 72 [59; 82] | 65 [47; 77] |
 Unknown | – | 4 (2) | – |
 Male gender | 121 (61) | 122 (61) | 129 (65) |
 Unknown | 9 (5) | 1 (1) | – |
 Location | |||
  Home | 157 (79) | 152 (76) | 142 (71) |
  Public | 19 (10) | 32 (16) | 42 (21) |
  Other | 24 (12) | 16 (8) | 16 (8) |
 Caller is health care personnel | 45 (23) | 30 (15) | 39 (20) |
 Unknown | – | 47 (24) | 6 (3) |
 Bystander witnessed | 106 (53) | 105 (53) | 103 (52) |
– | 5 (3) | – | |
 Bystander CPR | 130 (65) | 109 (55) | 183 (92) |
– | – | 4 (2) | |
 Bystander defibrillation (AED) | 14 (7) | 5 (3) | 8 (4) |
 Initial shockable rhythm | 33 (17) | 32 (16) | 33 (17) |
 CPR by EMT | 179 (90) | 189 (95) | 138 (69) |
 Defibrillation by EMT | 47 (24) | 64 (33) | 45 (23) |
Group 2: CPR initiated prior to call | Copenhagen (N = 69) | Stockholm (N = 9) | Oslo (N = 38) |
 Age (years) median [IQ1;IQ3] | 75 [60; 86] | 66 [62; 78] | 66 [44; 79] |
 Male gender | 31 (45) | 7 (78) | 26 (68) |
 Unknown | 3 (4) | – | – |
 Location | |||
  Home | 41 (59) | 2 (22) | 13 (34) |
  Public | 7 (10) | 4 (44 | 13 (34) |
  Other | 21 (30) | 3 (33) | 12 (32) |
 Caller is health care personnel | 39 (57) | 4 (44) | 17 (45) |
 Unknown | – | 4 (44) | – |
 Bystander witnessed | 30 (43) | 4 (44) | 24 (63) |
 Bystander defibrillation (AED) | 16 (23) | 1 (11) | 4 (11) |
 Initial shockable rhythm | 11 (16) | 2 (22) | 10 (26) |
 CPR by EMT | 56 (81) | 8 (89) | 26 (68) |
 Defibrillation by EMT | 14 (20) | 5 (63) | 11 (29) |
 Unknown | – | 1 (11) | – |