Table 3.
Correlations among CSD, single-channel EEG, actigraphy, and questionnaire total sleep time, sleep efficiency, and sleep midpoint across 7 nights at home.
| CSD | EEG | Actigraphy | |
|---|---|---|---|
| Total sleep time | |||
| EEG | .71*** | — | |
| Actigraphy | .75*** | .75*** | — |
| Questionnaire | .63*** | .57*** | .68*** |
| Sleep efficiency | |||
| EEG | .18 | — | |
| Actigraphy | .18 | .25* | — |
| Questionnaire | .42*** | .15 | .38** |
| Sleep midpoint | |||
| EEG | .98*** | — | |
| Actigraphy | .99*** | .99*** | — |
| Questionnaire | .92*** | .94*** | .93*** |
*
P < .05, **P < .01, ***P < .001. CSD = Consensus Sleep Diary, EEG = single-channel electroencephalography.