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Table 2 The differences in outcomes between datasets that included and excluded the unknown group

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

  Field ROSC CPC 1–2
Dataset including unknowns n = 15,472 n = 6932
 Conventional CPR 2135 13.8% 1127 16.3%
 Chest-compression-only CPR 7237 46.8% 3742 54.0%
 Overall PAD 1734 11.2% 1286 18.6%
Dataset excluding unknowns n = 13,707 n = 5902
 Conventional CPR 1781 13.0% 958 16.2%
 Chest-compression-only CPR 6112 44.6% 3038 51.5%
 Overall PAD 1734 12.7% 1286 21.8%
  1. Abbreviations: PAD, public access defibrillation; ROSC, return of spontaneous circulation; CPC, cerebral performance category; conventional CPR, CPR with rescue breathing; chest-compression-only CPR, CPR without rescue breathing
  2. Not shown: patients with non-resuscitation attempts by bystanders