Three-Month Retention of Basic Life Support with an Automated External Defibrillator Using a Two-Stage versus Four-Stage Teaching Technique

Table 3

Quality of chest compressions and ventilation.

	Two-stage	Four-stage	P-value
	(n=65)	(n=64)
Chest compressions
Chest compressions rate (min^−1)	108 (19)	107 (17)	0.78
Chest compressions number	30 (3.1)	29 (2.8)	0.21
Chest compression with correct hand placement (n (%))	54 (83%)	56 (88%)	0.62
Average compression depth (mm)	43 (11)	46 (10)	0.12
No-flow time (sec)	27 (11)	32 (19)	0.07
Rescue breaths
Numbers of rescue breaths	2.0 (0.5)	2.2 (0.4)	0.10
Number of sufficient rescue breaths	1.6 (0.8)	1.6 (0.7)	0.62
Tidal volume (L)	0.7 (0.4)	0.6 (0.4)	0.16

Individual skills are presented as n (%) and mean (SD). Tidal volume n = 57 versus 58 in the two groups