. 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 2.

Means (SD) and Correlations amongst PSQI Self-report Habitual, Polysomnography, Diary, and Actigraphy Measures of Sleep Duration

	PSG (Nights 1,2)	Actigraphy (Nights 1–2)	Diary (Nights 1–2)	Actigraphy (Nights 1–9)	Diary (Nights 1–9)	Mean (SD)
Self-report habitual sleep	0.14^*	0.29^***	0.28^***	0.40^***	0.51^***	6.46 (1.21 )
PSG (Nights 1,2)	--	0.66^***	0.56^***	0.34^***	0.23^**	6.10 ( 0.98)
Actigraphy (Nights 1–2)		--	0.69^***	0.64^***	0.38^***	5.98 (1.08)
Diary (Nights 1–2)			--	0.40^***	0.56^***	6.36 (1.32)
Actigraphy (Nights 1–9)				--	0.68^***	5.78 ( 0.89)
Diary (Nights 1–9)					--	6.64 ( 1.02)

Note:

p<0.05,

^**

p<0.01,

^***

p<0.001

Note all means differ by paired t-tests.