Table 5.

Intercepts, slopes, standard deviation of prediction, and 95% prediction intervals for averaged-over-week total sleep time, sleep efficiency, and sleep midpoint as measured by single-channel EEG, actigraphy, and diary compared with questionnaire.

	α	β	σ	95% p.i.
Total sleep time, h
CSD vs questionnaire	2.42	0.68	0.73	±1.42
EEG vs questionnaire	2.04	0.60	0.67	±1.31
Actigraphy vs questionnaire	1.68	0.67	0.66	±1.30
Sleep efficiency, %
CSD vs questionnaire	59.41	0.36	5.50	±10.79
EEG vs questionnaire	43.92	0.43	7.52	±14.74
Actigraphy vs questionnaire	48.69	0.38	5.69	±11.15
Sleep midpoint, t
CSD vs questionnaire	0.92	0.89	0.49	±0.95
EEG vs questionnaire	0.79	0.88	0.44	±0.85
Actigraphy vs questionnaire	0.95	0.87	0.45	±0.89

CSD = Consensus Sleep Diary, EEG = single-channel electroencephalography device, p.i. = prediction interval, t = time, α = intercept, β = slope, σ = standard deviation.