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| Not witnessed | Witnessed | |||
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| Site of incidencea | Total number (patients) | Percentage (%) | Odds ratio (95% CIb) | Percentage (%) | Odds ratio (95% CI) | |
| Witnessed or not | Outdoors | 758 | 45.8 | 1.00 | - | - | |
| Residences | 6414 | 41.7 | 0.54 (0.48 - 0.61) | - | - | ||
| Indoors | 567 | 66.0 | 1.48 (1.24 - 1.76) | - | - | ||
| Schools | 79 | 80.6 | 3.16 (1.89 - 5.27) | - | - | ||
| Others | 3 | 60.0 | 1.14 (0.19 - 6.84) | - | - | ||
| Bystander first aid | Outdoors | 377 | 28.3 | 1.00 | 49.7 | 1.00 | |
| Residences | 2844 | 25.7 | 0.88 (0.77 - 1.00) | 61.6 | 1.62 (1.39 - 1.89) | ||
| Indoors | 421 | 48.0 | 2.34 (1.96 - 2.80) | 72.7 | 2.69 (2.13 - 3.39) | ||
| Schools | 70 | 71.4 | 6.35 (4.03 - 9.99) | 88.6 | 7.86 (3.87 - 15.96) | ||
| Others | 1 | 20.0 | 0.64 (0.07 - 5.70) | 33.3 | 0.51 (0.05 - 5.60) | ||
| Defibrillation (Including defibrillation by EMS) | Outdoors | 343 | 25.7 | 1.00 | 5.3 | 1.00 | |
| Residences | 710 | 6.4 | 0.20 (0.17 - 0.23) | 15.4 | 0.22 (0.19 - 0.26) | ||
| Indoors | 220 | 25.6 | 1.00 (0.82 - 1.12) | 38.8 | 0.77 (0.61 - 0.96) | ||
| Schools | 46 | 46.9 | 2.56 (1.69 - 3.87) | 58.2 | 1.69 (1.05 - 2.70) | ||
| Others | 1 | 20.0 | 0.72 (0.08 - 6.48) | 33.3 | 0.60 (0.05 - 6.70) | ||
| ROSC prior to arrival to the hospital | Outdoors | 229 | 17.2 | 1.00 | 30.2 | 1.00 | |
| Residences | 750 | 6.8 | 0.35 (0.30 - 0.41) | 16.3 | 1.16 (0.10 - 12.80) | ||
| Indoors | 206 | 24.0 | 1.52 (1.23 - 1.88) | 36.3 | 1.31 (1.05 - 1.66) | ||
| Schools | 42 | 42.9 | 3.62 (2.37 - 5.53) | 53.2 | 2.62 (1.64 - 4.19) | ||
| Others | 1 | 20.0 | 1.21 (0.13 - 10.84) | 33.3 | 0.45 (0.48 - 0.53) | ||
| One-month survival rate | Outdoors | 113 | 8.5 | 1.00 | 14.9 | 1.00 | |
| Residences | 215 | 1.9 | 0.35 (0.30 - 0.41) | 3.6 | 0.28 (0.22 - 0.36) | ||
| Indoors | 91 | 10.6 | 1.28 (0.96 - 1.71) | 16.0 | 1.09 (0.81 - 1.47) | ||
| Schools | 23 | 3.5 | 3.31 (2.00 - 5.49) | 29.1 | 2.34 (1.39 - 3.96) | ||
| Others | 0 | 0.0 | - | 0.0 | - | ||