Table 1

Baseline characteristics of the intention-to-treat population

Primary careSleep unitP values
(n=149)(n=153)
Sex
 Male, n (%)108 (72.5%)107 (69.9%)0.717
Age (years)
 Mean (SD)53.1 (12.1)55.5 (12.2)0.092
BMI (kg/m2)
 Median (IQR)30.6 (28.0–34.2)30.2 (27.4–35.2)0.815
Smoking habits
 Current smokers, n (%)43 (29.3%)37 (26.4%)0.688
  Pack-year history
   Median (IQR)21.25 (9.25–30.00)15.0 (6.50–20.75)0.129
 Ex-smokers, n (%)30 (20.4%)44 (31.4%)
  Pack-year history
   Median (IQR)28.0 (22.62–43.75)20.0 (10.31–43.00)0.251
 Non-smokers, n (%)74 (50.3%)59 (42.1%)0.202
Blood pressure (mm Hg)
 Systolic blood pressure
  Mean (SD)135 (19.3)136 (19.3)0.573
 Diastolic blood pressure
  Mean (SD)81.2 (11.3)86.1 (11.9)<0.001
Arterial hypertension, n (%)60 (40.8%)71 (50.7%)0.118
Resistant hypertension, n (%)7 (4.76%)5 (3.57%)0.834
Depression, n (%)24 (16.3%)23 (16.4%)0.999
Dyslipidaemia, n (%)34 (23.1%)49 (35.0%)0.037
ESS score
 Median (IQR)10.3 (6.50–13.2)9.00 (4.89–12.1)0.018
EQ-5D (HUI)
 Median (IQR)0.80 (0.74–1.00)0.79 (0.74–1.00)
EQ-5D (VAS)
 Median (IQR)70.0 (50.0–80.0)75.0 (60.0–90.0)<0.001
AHI (events/h)
 Median (IQR)23.10 (10.30–37.10)21.80 (8.25–43.50)0.873
SaO2 (%)
 Mean (SD)92.00 (2.75)92.80 (3.13)0.002
  • 15 missing values for BMI, smoking habits, hypertension, depression, dyslipidaemia, ESS, EQ-5D, AHI and SaO2. 18 missing values for systolic and diastolic blood pressure.

  • AHI, Apnoea–Hypopnoea Index; BMI, Body Mass Index; EQ-5D, EuroQoL five-dimensions questionnaire; ESS, Epworth Sleepiness Scale; HUI, Health Utility Index; VAS, Visual Analogue Scale.