Baseline characteristics of the intention-to-treat population
| Primary care | Sleep unit | P 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.