Table 1.

Coefficients of the relative rate variation for the best model.

	Physiological ripples			Pathological ripples			Fast ripples
	REM	N2	N3	REM	N2	N3	REM	N2	N3
Stage	− 23.6*	4.6*	16.7*	− 25.2*	2.3*	23.7*	− 44.0*	8.5*	27.1*
AT	7.7*	7.0*	3.3*	2.8*	− 0.7*	− 7.7*	11.5*	− 0.6	− 14.3*
SW	− 0.9	1.8*	4.5*	3.7*	4.9*	8.4*	3.2*	6.0*	5.7*
DA	–	–	–	− 4.0*	− 1.6*	− 3.0*	− 7.1*	− 4.5*	− 3.0*
SA	0.5	4.4*	− 1.8*	7.4*	1.7*	− 2.8*	16.2*	9.4*	1.1

Units are percentages, except in the case of accumulated time, with units of percentage per hour. Asterisks indicate the coefficients significantly different from zero. For example, there is a 3.3% increase per hour during N3 sleep for physiological ripples, and a 14.3% decrease per hour for fast ripples. Legend. AT: accumulated time; SW: slow wave amplitude; DA: delta band activity; SA: sigma band activity.