TABLE 2.

Summary of results of cluster analyses according to clinical variables of interest in obstructive sleep apnoea (OSA) patients

Variable	First author [reference]	Results
Insomnia symptoms	Ye [87] Saaresranta [89] Gagnadoux [93]	Disturbed sleep cluster EDS+insomnia+ phenotype; EDS-insomnia+ phenotype Female OSA (cluster 1), comorbid OSA (cluster 6)
EDS	Ye [87] Vavougios [88] Saaresranta [89] Bailly [90] Mihaicuta [92] Gagnadoux [93] Lacedonia [91]	EDS cluster Clusters 4 and 5 EDS+insomnia+ phenotype; EDS-insomnia+ phenotype Young symptomatic OSA (cluster 1); drowsy obese (cluster 5), multimorbid OSA (cluster 6) Clusters 1–4 Clusters 2 and 3 Cluster 1
Female OSA	Ye [87] Vavougios [88] Saaresranta [89] Bailly [90] Lacedonia [91] Mihaicuta [92] Gagnadoux [93]	Disturbed sleep cluster (lowest percentage of male patients) Not identified Not identified Not identified Not identified Clusters 2 and 3 Cluster 1
Comorbid OSA, few OSA symptoms	Ye [87] Vavougios [88] Saaresranta [89] Bailly [90] Lacedonia [91] Mihaicuta [92] Gagnadoux [93]	Minimally symptomatic cluster Cluster 2 No EDS/no insomnia phenotype Cluster 3 Cluster 3 Clusters 4 and 5 Cluster 5
Young, severe OSA	Bailly [94] Lacedonia [91] Mihaicuta [92]	Young symptomatic OSA (cluster 1) and young snorer without comorbidities (cluster 4) Cluster 1 Cluster 7
Elderly OSA patients	Bailly [90] Lacedonia [91] Mihaicuta [92] Gagnadoux [93]	Older obese (cluster 2) and the multidiseased old obese (cluster 3) Cluster 3 Cluster 4 Clusters 4 and 5

EDS: excessive daytime sleepiness.