. Author manuscript; available in PMC: 2017 Jun 1.

Published in final edited form as: J Sleep Res. 2016 Feb 7;25(3):296–306. doi: 10.1111/jsr.12365

Table 2.

Correlation matrix of associations among predictors

	Age	Grey matter volume	aSWA	rSWA
Age	–	−0.63^***	−0.22	−0.47^*
Grey matter/ICV		–	0.19	0.32^*
aSWA			–	0.59^***

aSWA, absolute slow wave activity; rSWA, relative slow wave activity; ICV, intracranial volume.

P < 0.05;

^***

P < 0.001.