Table 2.
Difference of sleep parameters between polysomnography and the portable EEG/EOG recording system.
| PSG | Portable EEG/EOG recording system | Mann–Whitney | Effect size | Spearman rank correlation | ||||
|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | P | Cohen d | P | Correlation coefficient | |
| TST (min) | 381.8 | 58.9 | 394.1 | 103.9 | 0.753 | 0.15 | 0.693 | 0.167 |
| TIB (min) | 644.1 | 56.8 | 673 | 65.6 | 0.371 | 0.47 | 0.568 | 0.24 |
| SPT (min) | 507.2 | 95.8 | 508 | 92.8 | 1 | 0.01 | 0.01† | 0.833 |
| SOL (min) | 89 | 81.3 | 94.7 | 77.2 | 0.793 | 0.07 | 0.001† | 0.929 |
| WASO (times) | 30.7 | 9.7 | 25.5 | 12.3 | 0.246 | 0.47 | 0.003† | 0.896 |
| WASO (min) | 117.8 | 50.1 | 136 | 69.4 | 0.6 | 0.3 | 0.058 | 0.69 |
| WASO (%) | 29.9 | 10.3 | 39.8 | 26.4 | 0.674 | 0.49 | 0.002† | 0.905 |
| SE (%) | 60.6 | 7.8 | 55.5 | 11.7 | 0.345 | 0.51 | 0.015† | 0.81 |
| REM (%) | 6.7 | 7.7 | 13.3 | 10.9 | 0.093 | 0.70 | <0.001† | 0.976 |
| N1 (%) | 10.4 | 3.7 | 8.8 | 2.9 | 0.401 | 0.48 | 0.086 | 0.643 |
| N2 (%) | 52.7 | 6.4 | 55.9 | 10.5 | 0.401 | 0.37 | 0.12 | 0.595 |
| N3 (%) | 25 | 6.3 | 19.5 | 4.3 | 0.036† | 1.02 | 0.289 | 0.429 |
| RWA (%) | 5 | 6 | 1.9 | 1.8 | 0.293 | 0.70 | 0.435 | 0.323 |
| RWA/total SREM (%) | 37.3 | 36.1 | 17.1 | 13.6 | 0.431 | 0.74 | 0.028† | 0,762 |
TST: total sleep time; TIB: time in bed; SPT: sleep period time; WASO: wake time after sleep onset; SOL: sleep onset latency; SE: sleep efficiency; EEG/EOG: electroencephalography/electrooculography, †: P < 0.05.