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Table 3 The differences 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
COR (95% CI) AOR (95% CI) COR (95% CI) AOR (95% CI)
Dataset including unknowns
 Conventional CPR 1.92 (1.82–2.03) 1.49 (1.40–1.58) 2.90 (2.69–3.13) 1.90 (1.73–2.08)
 Chest-compression- only CPR 1.51 (1.46–1.57) 1.42 (1.36–1.48) 2.29 (2.17–2.42) 2.08 (1.95–2.22)
 PAD 6.42 (5.97–6.90) 4.06 (3.75–4.39) 9.84 (9.13–10.6) 4.51 (4.12–4.94)
Dataset excluding unknowns
 Conventional CPR 1.69 (1.59–1.79) 1.21 (1.13–1.30) 2.73 (2.52–2.96) 1.58 (1.43–1.75)
 Chest-compression- only CPR 1.34 (1.29–1.40) 1.19 (1.14–1.25) 2.03 (1.92–2.16) 1.69 (1.58–1.82)
 PAD 7.28 (6.77–7.82) 5.24 (4.83–5.68) 11.8 (10.9–12.7) 6.13 (5.57–6.74)
  1. Adjusted for the following confounding variables: age, sex, types of bystander(s) (others [reference], family), types of CPR (none [reference], conventional CPR, and chest-compression only CPR), PAD, dispatcher assistance, and response interval