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Table 1 Patient characteristics by study group classified using first monitored rhythm

From: The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database

Characteristics All (n = 91,995) Unknown rhythm (n = 2626) Shockable group (n = 20,673) Non-shockable group (n = 68,696)
Year, no. (%)
 2011 22,339 (24.3) 665 (25.3) 5077 (24.6) 16,597 (24.2)
 2012 22,566 (24.5) 575 (21.9) 5121 (24.8) 16,870 (24.6)
 2013 23,285 (25.3) 696 (26.5) 5252 (25.4) 17,337 (25.2)
 2014 23,805 (25.9) 690 (26.3) 5223 (25.3) 17,892 (26.0)
Age, median (25%, 75%)
  79 (67, 86) 78 (66, 86) 67 (56, 77) 81 (72, 88)
Age category, no. (%)
 0–15 years 513 (0.6) 68 (2.6) 126 (0.6) 319 (0.5)
 16–45 years 4338 (4.7) 152 (5.8) 2328 (11.3) 1858 (2.7)
 45–74 years 31,562 (34.3) 820 (31.2) 11,770 (56.9) 18,972 (27.6)
 75 years 55,582 (60.4) 1586 (60.4) 6449 (31.2) 47,547 (69.2)
Sex, no. (%)
 Male 55,993 (60.9) 1503 (57.2) 16,348 (79.1) 38,142 (55.5)
Types of bystanders, no. (%)
 Family member 57,600 (62.6) 1099 (41.9) 10,882 (52.6) 45,619 (66.4)
Bystander interventions, no. (%)
 Conventional CPR 9219 (10.0) 449 (17.1) 2766 (13.4) 6004 (8.7)
 Chest-compression-only CPR 37,756 (41.0) 1482 (56.4) 9698 (46.9) 26,576 (38.7)
 PAD 3210 (3.5) 0 (0.0) 3210 (15.5) 0 (0.0)
Dispatcher’s intervention, no. (%)
 Dispatcher assistance 43,671 (47.5) 1087 (41.4) 10,148 (49.1) 32,436 (47.2)
Response interval, median (25%, 75%)
  8 (7, 10) 8 (6, 10) 8 (6, 10) 9 (7, 11)
Outcomes, no. (%)
 Field ROSC 15,472 (16.8) 1765 (67.2) 7509 (36.3) 6198 (9.0)
 Favourable CPC 6932 (7.5) 1030 (39.2) 5003 (24.2) 899 (1.3)
  1. Abbreviations: CPR, cardiopulmonary resuscitation; PAD, public-access defibrillation; ROSC, return of spontaneous circulation; CPC, cerebral performance category
  2. Conventional CPR, CPR with rescue breathing; chest-compression-only CPR, CPR without rescue breathing
  3. Response interval: the time from 119 call to EMS contact with patients