Baseline characteristics
| Unit/category | Total (N=90) | Min | Max |
|---|---|---|---|
| Demographic information | |||
| Gender | |||
| Male | 72 (80%) | ||
| Female | 18 (20%) | ||
| Age at randomisation | |||
| Years | 50.9 (11.6) | 26.1 | 79.6 |
| BMI | |||
| Kg/m2 | 30.6 (27.9–35.1) | 23.9 | 54.5 |
| Smoking history | |||
| Non-smoker | 44 (49%) | ||
| Ex-smoker | 39 (43%) | ||
| Smoker | 7 (8%) | ||
| Clinical history | |||
| Previous CPAP | 4 (4%) | ||
| Asthma | 14 (16%) | ||
| Diabetes | |||
| Type I | 1 (1%) | ||
| Type II | 7 (8%) | ||
| Cardiovascular disease | |||
| Previous stroke | 2 (2%) | ||
| Previous TIA | 1 (1%) | ||
| Ischaemic heart disease | 5 (6%) | ||
| Hypertension | 23 (26%) | ||
| Sleep study | |||
| Apnoea-Hypopnoea Index | |||
| Events per hour | 13.8 (6.2) | 2.9 | 27.7 |
| Missing* | 1 | ||
| Oxygen Desaturation Index | |||
| Events per hour | 9.8 (5.2) | 0.6 | 22 |
| Minimum SpO2 | |||
| Per cent | 83.7 (4.7) | 71 | 91 |
| Missing* | 2 | ||
| Mean SpO2 | |||
| Per cent | 94.2 (1.3) | 89.8 | 97.7 |
| Missing* | 1 | ||
| Time <90% of nocturnal SpO2 | |||
| Minutes | 8.3 (2.9–24.8) | 0 | 315.4 |
| Missing* | 1 | ||
| Epworth Sleepiness Scale (ESS) | |||
| ESS | |||
| Unit score | 11.9 (3.5) | 3 | 20 |
Categorical variables show frequency (%) and continuous variables show either mean (SD) or median (IQR).
*One sleep study failed and inclusion was based on the Desaturation Index.
BMI, body mass index; TIA, Transient Ischaemic Attack.