Table 2

Description of and labels for the polysomnographic clusters based on distinguishing features

Cluster (n)Cluster labelMedian AHI*
OSA severity*
A (533)Mild4None/mild
B (119)PLMS10
C (186)NREM and poor sleep19Moderate
D (168)REM and hypoxia19
E (75)Hypopnoea and hypoxia44Severe
F (42)Arousal and poor sleep68
G (124)Combined severe84
  • *OSA severity definitions: none/mild (AHI <15), moderate (15≤ AHI<30) and severe (AHI ≥30). AHI was not used in generating patient clusters. Median AHIs and severity categories based on median AHI for each cluster are shown for descriptive purposes only (mean AHIs were 7.5, 13.6, 24.0, 25.0, 47.6, 72.6 and 82.4 for clusters A, B, C, D, E, F and G, respectively).

  • AHI,apnoea–hypopnoea index; NREM, non-rapid eye movement; OSA, obstructive sleep apnoea; PLMS, periodic limb movements of sleep; REM, rapid eye movement.