Table 1. Temporal ventilation distribution: Filling index of the right lung in different body positions.

	spontaneous	CPAP	PEP
upright healthy	0.97 (0.06)	0.96 (0.04)	0.95 (0.06)
		n.s.#	n.s.#
upright CF	0.96 (0.05)	0.95 (0.06)	0.96 (0.04)
		n.s.#	n.s.#
right lateral healthy	1.08 (0.03)	1.01 (0.01)	1.21 (0.11)
	p = 0.006*	p = 0.02*	p<0.001*
	[0.11 (0.07–0.15)]‡	[0.05 (0.03–0.07)]‡	[0.26 (0.19–0.33)]‡
		p = 0.008#	p<0.001#
right lateral CF	1.10 (0.17)	1.05 (0.10)	1.13 (0.24)
	p = 0.021*	p = 0.035*	p = 0.042*
	[0.14 (0.09–0.19)]‡	[0.10 (0.03–0.17)]‡	[0.17 (0.02–0.32)]‡
		n.s.#	n.s.#

Results are given as mean (standard deviation). An index >1 indicating a lag (slower filling than the rest of the lung) and an index <1 a lead (faster filling than the rest of the lung). Mean difference (95% confidence interval) to spontaneous breathing is noted in square brackets^‡.

p-values provided for comparison with the upright position* and for comparison with spontaneous breathing within the respective body position^#.

n.s. not significant; CF cystic fibrosis; CPAP continuous positive airway pressure; PEP positive end-expiratory pressure.