Table 2.
Characteristics of participants of the included studies
| Studies | n (E/C) | Mean age (years) | Male (%) | Mean BMI (kg/m2) | Mean AHI (events/h) | Duration of treatment (weeks) | CPAP usage (h/night) |
|---|---|---|---|---|---|---|---|
| Barbé et al., 2001[27] | 54 (29/25) | 53.1 | 0.91 | 29 | 55.4 | 6 | 4.5 |
| Bardwell et al., 2001[28] | 36 (20/16) | 47.4 | 0.81 | 31.4 | 50.9 | 1 | 5.2 |
| Barnes et al., 2004[23] | 80 | 46.4 | 0.79 | 31.0 | 21.5 | 12 | 3.6 |
| Engleman et al., 1994[22] | 32 | 49.0 | 0.81 | 33.0 | 28.0 | 4 | 3.7 |
| Engleman et al., 1997[20] | 16 | 52.0 | 1.00 | 29.8 | 11.0 | 4 | 2.8 |
| Engleman et al., 1999[21] | 23 | 47.0 | 0.91 | 30.0 | 43.0 | 4 | 2.8 |
| Gast et al., 2006[30] | 29 (17/12) | 52.3 | 1.00 | 37.1 | 43.1 | 1 | – |
| Engleman et al., 1998[26] | 34 | 44.0 | 0.62 | 30.0 | 10.0 | 4 | 2.8 |
| Kushida et al., 2012[31] | 1098 (556/542) | 51.5 | 0.65 | 32.3 | 40.1 | 24 | 3.8 |
| Marshall et al., 2005[24] | 29 | 50.5 | 0.76 | 31.5 | 22.0 | 2 | 4.9 |
| Monasterio et al., 2001[25] | 125 (66/59) | 53.5 | 0.54 | 29.4 | 20.5 | 24 | 4.8 |
| Pelletier–Fleury et al., 2004[29] | 171 (82/89) | 52.9 | 0.70 | 30.1 | 53.2 | 24 | 5.4 |
| Prilipko et al., 2012[32] | 17 (9/8) | 43.2 | 1.00 | 27.8 | 39.7 | 8 | – |
| Total | 1744 | 51.2 | 0.68 | 31.6 | 38.5 | 20.3 | – |
n: Number of participants; E: CPAP treatment group; C: Control group; Male (%): Ratio of male in all the participants; AHI: Apnea/hypopnea index; CPAP: Continuous positive airway pressure.