Table 4.

Correlation Coefficients Between Sleep Measures Determined by Wrist Actigraphy and Polysomnography

n = 455	Sleep Efficiency‡	Total Sleep Time‡	Respiratory Disturbance Index‡	% Sleep Time Sp02 <90%	Periodic Limb Movement Arousal Index‡	Periodic Limb Movement Index‡	Arousal Index‡	Slow Wave Sleep‡	REM Sleep‡
Actigraphy- sleep efficiency†	0.24	0.21	−0.21	−0.18	−0.18	−0.14	−0.24	−0.02	0.17
	(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)	(0.004)	(<0.001)	(0.61)	(<0.001)
Actigraphy-total sleep time†	0.03	0.20	−0.15	−0.11	−0.13	−0.07	−0.10	−0.04	0.06
	(0.52)	(<0.001)	(<0.001)	(0.02)	(0.007)	(0.13)	(0.03)	(0.40)	(0.17)

^†Sleep measures determined by proportional integration mode (PIM) wrist actigraphy

^‡Sleep measures determined by polysomnography

Spearman-RDI, % slp time <90%, PLMIA, PLMI (the others use Pearson because the variables are not skewed)