Table 1 Subject characteristics
OSAS with EDS (n = 22)OSAS without EDS (n = 22)Healthy subjects (n = 23)p Value (a, b, c)
Age (y)49 (6) (46 to 52)50 (5) (46 to 52)48 (6) (45 to 50)0.535, 0.142, 0.061
BMI (kg/m2)32 (3) (30 to 34)31 (4) (28 to 34)25 (3) (24 to 27)0.000, 0.230, 0.000
Hypertension (%)55650
SBP (mm Hg)139 (13) (135 to 146)147 (22) (137 to 157)128 (9) (124 to 132)0.010, 0.115, 0.001
DBP (mm Hg)92 (10) (88 to 96)93 (11) (89 to 97)78 (8) (75 to 82)0.000, 0.622, 0.000
Current smoker (%)48400
AHI (/h)52 (19) (44 to 60)48 (16) (40 to 56)3 (1) (1 to 4)0.000, 0.396, 0.000
Mean Sao2 (%)86 (6) (84 to 89)90 (5) (87 to 94)93 (2) (92 to 95)0.000, 0.040,0.040
Minimal Sao2 (%)69 (12) (64 to 75)81 (8) (75 to 86)NA0.010
ESS16 (3) (15 to 18)4 (3) (3 to 7)3 (2) (1 to 5)0.000, 0.000, 0.06
MSLT (min)5 (3) (3 to 7)15 (3) (13 to 17)NA0.000
Arousal index65 (19) (55 to 73)62 (25) (56 to 71)NA0.732
  • Results are presented as mean (SD) (95% confidence interval for the mean).

  • p values: a = OSAS with EDS vs controls; b = OSAS with EDS vs OSAS without EDS; c = OSAS without EDS vs controls.

  • AHI, apnoea–hypopnoea index; BMI, body mass index; DBP diastolic pressure; EDS, excessive daytime sleepiness; ESS, Epworth Sleepiness Scale; MSLT, multiple sleep latency time; NA, not available; OSAS, obstructive sleep apnoea syndrome; Sao2, arterial oxygen saturation; SBP, systolic blood pressure.