Table 3

Characteristics of patients with sleep-related hypoxaemia

CharacteristicsSleep-related hypoxaemia
Total number of patients7
Body mass index, mean (SD), kg/m229.9 (7.2)
Age, mean (SD), years63.1 (11.1)
Neck circumference, mean (SD), cm37.9 (9.5)
Male sex, n (%)1 (14.2)
STOP-Bang score, mean (SD)3.9 (1.7)
Epworth Sleepiness Scale, mean (SD)8.3 (5.9)
MME, median (IQR), mg per 24 hours157.5 (70–476.4)
Thyromental distance, mean (SD), cm7.8 (1.5)
Medical conditions, n (%)
 Active smoker3 (42.9)
 Asthma/COPD0
Sleep parameters
Apnoea-Hypopnoea Index, median (IQR), events/hour15.8 (5.6–55.9)
Obstructive apnoea index, median (IQR), events/hour9 (5.4–55.7)
Central Apnoea Index, median (IQR), events/hour1.3 (0.2–5.2)
Mixed apnoea index, median (IQR), events/hour0 (0–1.1)
Hypopnoea index, median (IQR), events/hour7.7 (3.1–41.7)
Mean SpO2, mean (SD), %88.4 (1.5)
Minimum SpO2, mean (SD), %75 (4)
CT90, median (IQR), %79.5 (72.8–96.6)
  • Values are expressed as mean (SD) or median (IQR) as appropriate.

  • COPD, chronic obstructive pulmonary disease; CT90, cumulative time SpO2 <90%; MME, morphine milligram equivalents; SpO2, oxyhaemoglobin saturation; STOP-Bang, a screening tool for sleep apnoea (Snoring, Tiredness, Observed apnoea, high blood Pressure, Body mass index, age, neck circumference and male gender).