Table 1. Results of abdominal movement signals correlated to volume signals from spirometer.

No.	r	p	N
V1	0.904	<0.001	3000
V2	0.896	<0.001	3000
V3	0.928	<0.001	3000
V4	0.809	<0.001	3000
V5	0.935	<0.001	3000