Table 2.
The differences between CPAP return and keep groups according to demographic data and the results from polysomnographic findings.
| Characteristic | CPAP Fail (n = 278) | CPAP Keep (n = 372) | p |
|---|---|---|---|
| Female (n,%) | 66,48.5 % | 70,51.5 % | |
| Male (n,%) | 212,41.2 % | 302, 58.8 % | |
| Age (yrs) | 52.02 (±13.72) | 49.15 (±12.88) | |
| BMI (kg/m2) | 26.76 (±4.83) | 27.79 (±5.17) | .009∗ |
| TST (minutes) | 375.83 (±57.02) | 371.97 (±52.15) | .376 |
| N1 (%) | 32.32 (±22.49) | 32.74 (±16.47) | .791 |
| N2 (%) | 42.99 (±18.12) | 39.93 (±10.71) | .012 |
| N3 (%) | 9.80 (±7.08) | 10.05 (±7.27) | .654 |
| REM (%) | 18.34 (±8.14) | 17.27 (±6.38) | .072 |
| Total wake time (minutes) | 14.08 (±22.66) | 11.71 (±9.72) | .103 |
| WASO (minutes) | 59.00 (±55.51) | 51.73 (±43.15) | .071 |
| Latency to sleep (minutes) | 10.95 (±17.41) | 9.52 (±10.26) | .222 |
| Latency to REM onset (minutes) | 116.51 (±78.03) | 114.62 (±74.18) | .756 |
| Sleep efficiency (%) | 84.59 (±11.92) | 85.85 (±10.17) | .156 |
| AHI (per hour) | 41.17 (±21.04) | 47.33 (±23.02) | <.001∗ |
| RDI (per hour) | 41.93 (±20.70) | 47.88 (±22.78) | <.001∗ |
| PLMS (per hour) | 5.75 (±16.02) | 4.60 (±14.28) | .344 |
BMI, Body mass index; TST,Total Sleep Time; N, Non-REM stage; REM, Rapid eye movement; WASO, wakefulness after sleep onset; AHI, Apnea hypopnea index; RDI, respiratory disturbance index; PLMS, Periodic limbs movement during sleep.