Table 2.
Patient characteristics according to the average AMSA tertiles.
| Variable | Average AMSA | p-value | ||
|---|---|---|---|---|
| T1 | T2 | T3 | ||
| 1.4–7.7 mV Hz | 7.7–12.7 mV Hz | 12.7–63.1 mV Hz | ||
| Age (IQR) (years) | 69 (58–78) | 67 (57–76) | 68 (56–77) | 0.6 |
| Number of shocks (IQR) | 3 (1–7) | 4 (1–6.5) | 2 (1–5) | <0.001 |
| Epinephrine (mg) (IQR) | 5 (4–7) | 5 (2–6) | 3 (2–5) | <0.001 |
| EMS arrival time | 10 (7.4–14.2) | 10 (6.9–13.9) | 8.8 (6.8–12.3) | 0.01 |
| Male gender (%) | 153 (81) | 148 (84) | 123 (74) | 0.06 |
| Home location (%) | 135 (73) | 125 (71) | 103 (62) | 0.12 |
| Medical aetiology (%) | 173 (91) | 168 (95) | 152 (92) | 0.24 |
| Witnessed event (%) | 139 (73) | 146 (84) | 146 (90) | <0.001 |
| Bystanders CPR (%) | 131 (69) | 111 (65) | 117 (72) | 0.35 |
| Telephone CPR (%) | 94 (50) | 84 (50) | 93 (57) | 0.31 |
| Shockable presenting rhythm (%) | 107 (56) | 130 (68) | 125 (65) | <0.001 |
| Rhythm conversion from non-shockable to shockable (%) | 83 (44) | 65 (32) | 68 (35) | <0.001 |
| Mechanical CPR (%) | 128 (68) | 111 (64) | 94 (57) | 0.04 |