Table 2.
Depth and release velocity of CC.
| Parameters | Children manikin | Infant manikin | |||||
|---|---|---|---|---|---|---|---|
| 15:2 ratio | 30:2 ratio | p | 15:2 ratio | 30:2 ratio | p | ||
| (n = 26) | (n = 26) | (n = 26) | (n = 26) | ||||
| Mean depth (cm) Mean (SD) | Minute 1 | 4.4 (0.8) | 4.4 (0.9) | 0.84 | 3.1 (0.5) | 3.1 (0.6) | 0.62 |
| Minute 2 | 4.4 (0.8) | 4.3 (0.8) | 0.81 | 3.0 (0.5) | 3.0 (0.6) | 0.99 | |
| Minute 3 | 4.4 (0.8) | 4.3 (0.8) | 0.45 | 3.1 (0.5) | 3.0 (0.5) | 0.07 | |
| Global | 4.4 (0.8) | 4.3 (0.8) | 0.66 | 3.1 (0.5) | 3.0 (0.5) | 0.41 | |
| Percentage of chest compressions Mean (SD) | Lower depth than optimal | 27.7 (37.6) | 31.5 (41.3) | 0.35 | 44.9 (39.2) | 51.8 (41.3) | <0.01 |
| Optimal depth | 48.4 (37.3) | 44.1 (38.1) | 0.83 | 52.7 (36.8) | 43.7 (38.0) | <0.01 | |
| Higher depth than optimal | 23.9 (36.4) | 24.4 (36.5) | 0.94 | 2.4 (4.9) | 4.5 (14.5) | 0.015 | |
| Release velocity (mm/s) Mean (SD) | Minute 1 | 300.7 (59.4) | 296.5 (79.9) | 0.71 | 239.0 (44.3) | 243.2 (61.6) | 0.011 |
| Minute 2 | 284.2 (56.6) | 273.2 (64.7) | 0.22 | 226.7 (45.3) | 213.8 (44.4) | <0.01 | |
| Minute 3 | 288.9 (58.9) | 266.0 (65.1) | 0.017 | 223.5 (47.0) | 208.8 (41.6) | <0.01 | |
| Mean | 291.3 (54.4) | 278.6 (67.3) | 0.13 | 229.8 (42.7) | 221.9 (45.8) | 0.23 | |
Paired T-student test.