TABLE 1

Patient characteristics within the four Baveno groups A–D

	Group A (n=3447)	Group B (n=2771)	Group C (n=4482)	Group D (n=3799)
Females %	28.1	28.1	27.8	27.8
Age years	54 (44; 62)***^,¶,+	52 (43; 60)***^,¶	57 (48; 65)***	56 (47; 63)
BMI kg·m⁻²	30.0 (26.9; 33.8)***^,¶,+	31.0 (27.4; 35.3)***^,¶	31.7 (28.1; 36.3)***	33.6 (29.8; 38.3)
Systolic BP mmHg	125 (120; 130)***^,¶	125 (120; 130)***^,¶	140 (130; 150)	140 (130; 150)
Diastolic BP mmHg	77 (70; 80)***^,¶	77 (70; 80)***^,¶	85 (78; 91)	85 (79; 91)
ESS^#	6 (4; 8)***^,+	14 (12; 16)^¶	6 (4; 8)***	14 (12; 17)
AHI events·h⁻¹	27.0 (14.3; 44.3)***^,¶,+	31.5 (17.4; 53.5)***^,¶	28.2 (15.6; 49.8)***	37.7 (19.5; 63.3)
ODI events·h⁻¹	22.8 (10.4; 42.0)***^,¶,+	27.4 (11.8; 51.5)***	24.9 (11.9; 47.0)***	35.0 (15.2; 61.9)
Mean S_pO₂ %	93.4 (92.0; 95.0)***^,¶,+	93.0 (91.0; 95.0)***	93.0 (91.0; 94.8)***	92.1 (90.0; 94.0)
Minimum S_pO₂ %	82 (77; 87)***^,¶,+	81 (74; 86)***	81 (74; 86)***	78 (70; 84)
t₉₀ min	8.7 (1.0; 38.5)***^,¶,+	15.0 (1.9; 62.8)***	13.0 (2.0; 59.0)***	31.0 (4.9; 102.0)

Data are presented as median (quartile 1; quartile 3) unless otherwise stated. BMI: body mass index; BP: blood pressure; ESS: Epworth Sleepiness Scale; AHI: apnoea–hypopnoea index; ODI: oxygen desaturation index; S_pO₂: oxygen saturation as measured by pulse oximetry; t₉₀: percentage of sleep time with S_pO₂<90%. ^#: scale 0–24. ***: p<0.001 versus D; ^¶: p<0.001 versus C; ⁺: p<0.001 versus B.