. Author manuscript; available in PMC: 2018 Nov 1.

Published in final edited form as: Respirology. 2017 Jul 20;22(8):1662–1669. doi: 10.1111/resp.13108

Table 2.

Lung volume and loop gain measure in the supine and lateral position

Parameter	Lateral	Supine	P-Value
FRC (% of seated volume)	87.3 ± 18.4	81.0 ± 15.4	0.021
Loop gain, LG₁	0.68 ± 0.14	0.77 ± 0.15	0.012
Time constant, s	107.2 ± 42.0	109.8 ± 29.3	0.855
Chemoreflex delay, s	10.8 [9.45 to 12.24]	10.35 [9.03 to 11.0]	0.079
Tn, s	37.93 [34.54 to 41.65]	38.08 [31.61 to 42.74]	0.370

Values are means ± SD. or medians [interquartile range]. Paired samples t-test for parametric paired data, Wilcoxon signed rank for non-parametric paired data. Abbreviations: LG: loop gain, ventilatory response to 1 cycle/min disturbance; Tn: natural cycling period. Arousal threshold is the estimated ventilatory drive preceding scored EEG arousal from sleep³⁸.