. Author manuscript; available in PMC: 2019 Feb 1.

Published in final edited form as: Sleep Health. 2017 Dec 13;4(1):96–103. doi: 10.1016/j.sleh.2017.10.011

Table 3.

Prediction of Polysomnography Sleep Duration (M=6.10, SD = .98) by Other Measures of Sleep Duration (N=215)

	Mean (SD)	Mean Difference from PSG (SD)	Paired T-test P-value	Correlation (P-value)	β (95% C.I.)
Self-report habitual sleep	6.46 (1.21)	−0.37 (1.45)	<0.001	0.14 (0.05)	0.11 (0.00, 0.22)
Actigraphy (Nights 1–2)	5.98 (1.08)	0.12 (0.85)	0.040	0.66 (<0.001)	0.60 (0.51, 0.69)
Diary (Nights 1–2)	6.35 (1.32)	−0.26 (1.12)	0.001	0.56 (<0.001)	0.41 (0.33, 0.50)
Actigraphy (Nights 1–9)	5.78 (0.89)	0.31 (1.08)	<0.001	0.34 (<0.001)	0.37 (0.24, 0.51)
Diary (Nights 1 – 9)	6.62 (1.02)	−0.53 (1.24)	<0.001	0.23 (<0.001)	0.22 (0.10, 0.24)