. Author manuscript; available in PMC: 2018 Apr 24.

Published in final edited form as: Eur Respir J. 2017 Sep 20;50(3):1700345. doi: 10.1183/13993003.00345-2017

Table 2.

Participants’ polysomnographic parameters

Endoscopy Physiology Study (N=23)^*					Nasal Pressure Study (N=10)
	All subjects (n=23)	Non-epiglottic collapse (n=18)	Epiglottic collapse (n=5)	p	Nasal Pressure Study (N=10)
TST(min)	291 ± 93 ^a	286 ± 99 ^a	305 ± 76 ^a	0.7	306 ± 70.9
SE (%)	70.4 ± 14.4 ^a	71.0 ± 14.6 ^a	68.5 ± 15.0 ^a	0.7	71.9 ± 13.9
NREM 1(%TST)	27.6 ± 24.8 ^a	27.0 ± 26.4 ^a	29.4 ± 22.1 ^a	0.9	28.2 ± 20.1
NREM 2(%TST)	57.0 ± 20.2 ^a	56.8 ± 21.3 ^a	57.6 ± 18.5 ^a	>0.9	56.2 ± 16.3
NREM 3(%TST)	1.5 ± 2.9 ^a	1.6 ± 3.1 ^a	1.0 ± 2.3 ^a	0.7	6.8 ± 13.9
REM(%TST)	14.1 ± 8.9 ^a	14.8 ± 8.5 ^a ^c	12.1 ± 10.6 ^a	0.6	8.8 ± 6.0
AHI (events/hour)	48.6 ± 30.4	51.1 ± 33.0	40.7 ± 20.8	0.5	42.0 ± 25.5
ArI (events/hour)	43.0 ± 31.3 ^a	42.3 ± 34.6 ^a	45.3 ± 20.3 ^a	0.9	44.7 ± 20.1
Nadir SaO₂ (%)	81.7 ± 9.4 ^a	83.1 ± 8.4 ^a	77.2 ± 12.0 ^a	0.2	83.4 ± 12.5

Data are presented as mean ± standard deviation.

Polysomnography data were analyzed retrospectively.

TST: total sleep time; SE: sleep efficiency; NREM 1, NREM 2, NREM 3: non-rapid eye movement sleep stages 1–3; AHI: apnea-hypopnea index; ArI: arousal index; SaO₂: oxygen hemoglobinic saturation.

Two data points are missing from calculation.