Table 5.

Significant Correlations between Fatigue, Subjective Sleep, and Actigraph Measures of Sleep/Wake, Activity/Rest, and Circadian Rhythm (n=128–130)

Variable	Fatigue (Total score/PFS)	Subjective Sleep (Total score/PSQI)	Sleep Quality	Sleep latency	Sleep duration	Habitual sleep efficiency	Sleep disturbances	Use of sleeping medication	Daytime dysfunction
Fatigue (Total Score/PFS)		0.36b	0.31c	0.25c			0.28c	0.25c	0.42b
Actigraph Sleep/Wakea
Sleep-onset latency			0.18d
Total sleep time		0.16 e				0.15 e		0.25c
Number of awakenings							0.24c
Wake after sleep onset					−0.20 d		0.18d
Sleep Efficiency					0.15 e		−0.17 d	0.18d
Actigraph Activity/Rest
Mean daytime activity		−0.22c		−0.21 c		−0.16 e	−0.15 e
Wake time day	−0.15 e	−0.23 b
Wake percent		−0.21c
Sleep time day		0.21 c
Sleep percent		0.21 c
Circadian rhythms
Mesor		−0.27c	−0.18d	−0.24 c		−0.18d
Amplitude				−0.18 d
Acrophase	0.20d			0.16 e	−0.24c			0.17d
Goodness of Fit								0.16 e

^aObjective sleep variables obtained from wrist actigraphy.

^bP<0.001.

^cP<0.01.

^dP<0.05.

^eTrend t = 0.051–0.10.