Table 2.

The rate of chest compressions per minute according to each compression depth

	Rate of chest compressions per minute with a depth of more than 5 cm (mean ± SD, %)			Rate of chest compressions per minute with a depth of more than 4 cm (mean ± SD, %)
Time (minute)	ST-CPR	CO-CPR	p-value	ST-CPR	CO-CPR	p-value
1	68 ± 39	60 ± 39	0.136	91 ± 21	89 ± 27	0.572
2	52 ± 45	41 ± 43	0.015	84 ± 28	74 ± 38	0.093
3	49 ± 46	32 ± 41	0.003	80 ± 34	65 ± 42	0.019
4	41 ± 42	25 ± 40	0.004	75 ± 36	59 ± 44	0.009
5	42 ± 23	23 ± 37	0.001	74 ± 36	54 ± 44	0.002
6	41 ± 44	21 ± 37	0.001	70 ± 41	49 ± 46	0.002
7	38 ± 42	18 ± 35	0.001	70 ± 41	44 ± 46	<0.001
8	38 ± 44	18 ± 35	0.001	68 ± 40	41 ± 45	<0.001