Table 3.

RMSE and baseline drift of abdominal motion averaged over all of the studies and paired Student t-test p-value comparing the breathing methods (FB denotes free breathing and AV denotes AV biofeedback).

Abdominal motion		RMSE in displacement (mm)	p-value	RMSE in period (s)	p-value	Baseline drift (mm/min)	p-value
First session	FB	1.2	0.0016	1.2	0.0008	0.21	0.007
	AV	0.8 (−33%)		0.4 (−67%)		0.06 (−70%)
Second session	FB	1.3	<0.0001	1.9	0.0008	0.22	0.011
	AV	0.6 (−54%)		0.3 (−84%)		0.04 (−80%)
All sessions	FB	1.3	<0.0001	1.6	<0.0001	0.21	<0.0001
	AV	0.7 (−46%)		0.3 (−81%)		0.05 (−75%)