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. 2020 Apr 22;10:6828. doi: 10.1038/s41598-020-63921-9

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.