Table 1– Demographic and clinical characteristics of the total cohort and by clusters

	Total cohort	Cluster 1	Cluster 2	Cluster 3	p-value
Subjects n	822	269	203	350
% of total	100	32.7	24.7	42.6
Males n (%)	666 (81.0)	211 (78.4)	170 (83.7)	285 (81.4)	0.336
Age years	54.5±10.6	54.1±11.0	56.6±10.3	53.6±10.3	0.005
BMI kg·m⁻²	33.5±5.7	33.3±5.6	33.0±5.6	34.0±5.8	0.130
AHI events·hour⁻¹	44.9±20.7	43.8±20.4	43.1±18.9	46.7±21.7	0.181
ODI events·hour⁻¹	35.5±20.2	34.0±18.4	33.5±18.9	37.8±21.9	0.117
Minimum oxygen saturation %	76.2±8.0	76.5±7.8	76.7±7.7	75.7±8.4	0.385
SF-12 physical component score	40.3±10.9	39.7±10.5	45.4±9.9	37.7±10.7	<0.001
SF-12 mental component score	48.3±10.9	46.9±11.2	52.9±9.6	46.6±10.7	<0.001

Data are presented as mean±sd, unless otherwise stated. BMI: body mass index; AHI: apnoea–hypopnoea index; ODI: oxygen desaturation index; SF-12: 12-item Short Form Health Survey.