Table 1.
Characteristics of included studies (5 studies, 6 cohorts).
| First author | Year | Nation | Sample size/male | Inclusion criteria | Daily duration (h/night) | CPAP duration | Study design |
|---|---|---|---|---|---|---|---|
| Sahebjami | 1998 | USA | 20/20 | OSAHS (NR) | NR | 1 D | SCT |
| Steiropoulos (≥4 h) | 2009 | Greece | 32/32 | AHI ≥ 5 | ≥4 h | 6 M | SCT |
| Steiropoulos (<4 h) | 2009 | Greece | 20/20 | AHI ≥ 5 | <4 h | 6 M | SCT |
| Prudon | 2013 | UK | 19/19 | ODI > 10, with ESS ≥ 9 | <4 h | 3 M | RCT |
| Seetho | 2015 | UK | 28/16 | AHI ≥ 5 | ≥4 h | 14 M | SCT |
| Campos-Rodriguez | 2018 | Spanish | 151/0 | AHI ≥ 15 | ≥4 h | 3 M | RCT |
Abbreviation: CPAP: continuous positive airway pressure, AHI: apnea-hypopnea index, ODI: oxygen desaturation index, ESS: epworth sleepiness scale, M: month, D: day, h: hour, NR: not reported, SCT: self-control trials, RCT: randomized controlled trials.