Canadian Respiratory Journal

Research Article

Prevalence of Sleep-Disordered Breathing in Prader–Willi Syndrome

Table 2

PSG data of the patients with PWS (n = 20).


PSG variables	All patients

Sleep efficiency (%)^b	83.1 (76.8–88.1)
Sleep latency (minutes)^b	12.35 (2.9–48.6)
REM latency (minutes)^b	64.5 (55.5–127)
WASO (minutes)^b	51.2 (31–80.5)
REM (%) of TST^b	20.85 (17.8–32.7)
AHI (events/hour)^b	8.55 (5.8–16.9)
OAHI (events/hour)^b	7.29 (1.8–13.5)
CAHI (events/hour)^b	1.77 (0.6–4.1)
REM-AHI (events/hour)^b	27.8 (15–50.6)
Sleep apnea types, n (%)
CSA	3 (15.0)
OSA	9 (45.0)
Mixed	7 (35.0)
Categories of OSA, n (%)
Mild	3 (15.0)
Moderate	8 (40.0)
Severe	8 (40.0)
Mean sleep SpO₂, (%)^a	95.45 ± 2.9
SpO₂ nadir (%)^a	78.6 ± 7.1
% of TST with SPO₂ <90% (%)^b	0.58 (0.1–2.9)
Peak ETCO₂ (mmHg)^a	52.0 ± 8.2
Respiratory support, n (%)	7 (35.0)

Data are expressed as mean ± standard deviation or median (IQR). Categorical variables are expressed as frequencies and percentages. WASO, wakefulness after sleep onset; AHI, apnea-hypopnea index; OAHI, obstructive apnea-hypopnea index; CAHI, central apnea-hypopnea index; CSA, central sleep apnea; OSA, obstructive sleep apnea; TST, total sleep time; ETCO₂, end-tidal CO₂; SpO₂, O₂ saturation. The table provides descriptive data for the entire population. The bold values represent the median and interquartile range.