Table 2.

Respiratory and Sleep Parameters in Study Participants

	Entire group	Nocturnal saturation subgroups			AHI subgroups
		Marked	Mild	p	Low	High	p
Participants	10	5	5		5	5
Wakefulness SpO2
SL	98.5 (98.0–98.5)	98.5 (98.0–98.5)	98.5 (98.0–98.5)	0.78992	98.5 (98.0–98.5)	98.5 (98.0–98.5)	0.1253
HA	94.0 (92.5–95.0)	94.0 (92.5–95.0)	94.0 (93.0–95.0)	0.7316	93.5 (92.0–94.5)	95.0 (93.0–95.0)	0.0933
Sleep parameters
Mean nocturnal saturation (%)
SL	95.7 (95.1–96.2)	95.5 (94.8–96.0)	95.8 (95.2–96.2)	0.1	95.8 (95.3–96.4)	95.7 (94.8–96.1)	0.14
HA	86.9 (84.7–88.9)	85.2 (83.3–85.8)	88.3 (87.0–90.3)	0.0095	84.7 (82.9–88.6)	87.3 (86.3–89.2)	0.14
AHI (events per hour)
SL 3% + arousals	1.40 (0.80–3.00)	0.85 (0.65–1.30)	2.40 (1.10–3.30)	0.0275	0.90 (0.65–2.25)	2.30 (1.10–3.30)	0.0973
SL 4%	0.70 (0.40–1.50)	0.45 (0.25–0.65)	1.50 (0.70–2.30)	0.0002	0.50 (0.40–0.75)	1.50 (0.40–2.30)	0.02
HA 3% + arousals	10.30 (5.70–15.40)	5.90 (2.80–13.20)	14.90 (8.20–15.40)	0.24	5.70 (2.60–8.15)	15.15 (11.70–16.15)	0.0207
HA 4%	4.65 (2.20–7.80)	2.70 (2.00–4.30)	9.80 (5.00–12.60)	0.0172	2.20 (1.55–2.95)	7.80 (5.65–11.45)	0.0008
Hypopnea index
SL	0.54 (0.17–1.17)	0.34 (0.08–0.73)	0.58 (0.33–1.71)	0.44	0.34 (0.08–1.13)	0.68 (0.33–1.17)	0.29
HA	5.68 (4.06–9.30)	5.39 (2.54–10.11)	5.98 (4.51–7.72)	0.79	5.08 (2.47–7.75)	7.57 (5.24–9.30)	0.25
% Central hypopneaa
SL	50% (25%–88%)	25% (0%–50%)	81% (50%–100%)	0.0001	25% (0%–50%)	72% (50%–97%)	0.01
HA	86% (72%–96%)	79% (60%–88%)	90% (80%–97%)	0.071	86% (73%–95%)	82% (60%–96%)	0.426
Apnea indexb
SL	0.70 (0.40–1.50)	0.40 (0.25–0.50)	1.30 (0.70–2.00)	0.0002	0.45 (0.30–0.75)	1.20 (0.40–2.00)	0.0167
HA	1.75 (0.40–5.00)	0.50 (0.30–1.40)	6.80 (2.20–11.30)	0.005	0.40 (0.30–0.65)	5.00 (2.45–9.50)	0.0011

Data are presented as n or median (interquartile range). The mean nocturnal saturation: mean nocturnal S_pO₂.

^aRemaining hypopneas were all obstructive.

^bAll the apneas at SL and HA were central.