TABLE 1.
Demographics and sleep macrostructure of the participants.
| N = 24 | |||||
| Age | Years | 55 (17) | |||
| Sex | Female | 29% | |||
| BMI | kg/m2 | 33.8 (7.4) | |||
| Diagnostic AHI4% (N = 22) | /h | 41.2 (29.0) | |||
| Diagnostic AHI3A/RDI (N = 22) | /h | 55.8 (21.9) | |||
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| CPAP | OSASWS | OSASWS + O2 | p-value | ||
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| Total sleep time (TST) | h | 6.6 (1.0) | 6.6 (0.8) | 7.1 ± 1.2 | n.s. |
| Sleep efficiency (SE) | % TST/TIB | 88.0 (8.8) b | 88.6 ± 8.4 | 92.6 (6.7) | 0.04 |
| Sleep onset latency (SOL) | min | 4.4 (5.2) | 4.2 (5.8) | 3.1 (7.0) | n.s. |
| Wake after sleep onset (WASO) | min | 47.0 (41.9) | 31.8 (50.3) | 28.8 (36.2) | n.s. |
| NREM 1 | %TST | 10.4 (4.3) | 9.4 (4.9) | 8.7 (5.8) | n.s. |
| NREM 2 | %TST | 51.6 ± 7.1 | 54.1 ± 8.5 | 54.1 ± 6.4 | n.s. |
| NREM 3 | %TST | 16.2 (5.9) a,b | 13.8 (10.0) | 13.1 (5.6) | 0.01 |
| REM | %TST | 21.4 ± 5.8 | 20.4 ± 5.9 | 21.9 ± 5.2 | n.s. |
AHI4%, apnea-hypopnea index (hypopnea 4% O2 desaturation criteria); AHI3A, apnea hypopnea index [hypopnea 3% O2 desaturation/electroencephalographic (EEG) arousal criteria]; TST, total sleep time; REM, rapid eye movement; NREM 1, non-REM stage 1; NREM 2, non-REM stage 2; SWS, slow-wave sleep.
aSignificant difference between continuous positive airway pressure (CPAP) and OSASWS conditions.
bSignificant difference between CPAP and OSASWS + O2 conditions; n.s., not significant. Values expressed as mean ± SD or median (interquartile range). All significance levels are for the Friedman or one-way repeated measures ANOVA tests.