Table 2

Manual (ie, delivered) and LVR counter recorded counts for compressions and repetitions, for each experiment

	Compressions			Repetitions
	Manual count	LVR counter	Percent error (95% CI)	Manual count	LVR counter	Percent error (95% CI)
Experiment 1	50	49	2
Experiment 2
Set 1	30	34	13 (5 to 30)	10	10	0 (0 to 28)
Set 2	30	34	13 (5 to 30)	10	10	0 (0 to 28)
Set 3	30	39	30 (17 to 48)	10	10	0 (0 to 28)
Set 4	30	29	3 (0.6 to 17)	10	10	0 (0 to 28)
Experiment 3
Zero leak	100	118	18 (12 to 27)
Minimal leak	100	86	14 (9 to 22)
Moderate leak	100	0	0 (0 to 4)
Large leak	100	0	0 (0 to 4)

Experiment 1, low-pressure bench test; Experiment 2, high-pressure bench test; and Experiment 3, simulated leak bench test.
LVR, lung volume recruitment.