Table 3.
Polysomnography measures before and after 6 months of CPAP treatment
| Baseline | CPAP | Difference | P | |
|---|---|---|---|---|
| Time in bed (min) | 460.44 (39.97) | 450.36 (29.15) | −10.08 (−19.93 to −0.24) | .0448 |
| Total sleep time (min) | 367.92 (54.19) | 386.79 (43.39) | 18.87 (7.59 to 30.15) | .0013 |
| NREM sleep (min) | 287.59 (52.54) | 286.79 (39.87) | −0.81 (−12.35 to 10.73) | .89 |
| Stage N1 (min) | 19.39 (17.97) | 18.53 (14.20) | −0.86 (−4.91 to 3.20) | .68 |
| Stage N2 (min) | 232.23 (55.80) | 172.63 (56.87) | −59.60 (−76.04 to −43.16) | <.0001 |
| Stage N3,SWS (min) | 55.36 (39.56) | 114.16 (51.27) | 58.79 (46.14 to 71.45) | <.0001 |
| REM sleep (min) | 60.94 (31.36) | 81.47 (25.95) | 20.53 (13.19 to 27.87) | <.0001 |
| Sleep efficiency (%) | 80.15 (11.15) | 86.09 (9.58) | 5.95 (3.64 to 8.25) | <.0001 |
| Wake after sleep onset (min) | 68.49 (44.31) | 49.80 (37.83) | −18.67 (−29.05 to −8.29) | .0006 |
| Arousal index (events/h) | 34.06 (21.05) | 17.92 (9.48) | −16.14 (−21.22 to −11.06) | <.0001 |
| AHI (events/h) | 34.80 (24.74) | 4.33 (3.41) | −30.47 (−35.89 to −25.06) | <.0001 |
| ODI (events/h) | 30.23 (26.81) | 3.68 (3.38) | −26.55 (−33.06 to −20.05) | <.0001 |
| Minimum SaO2 (%) | 78.19 (11.28) | 90.58 (3.61) | 12.39 (9.64 to 15.13) | <.0001 |
Data are mean (standard deviation) and mean difference (95% CI). P values are calculated using paired t tests. AHI: Apnea hypopnea index; ODI: 3% oxygen desaturation index; NREM: Non rapid eye movement; REM: rapid eye movement; SaO2: oxygen saturation; SWS: slow wave sleep. Bold values indicate p < 0.05.