TABLE IV -.

Average changes in time-domain HRV-alone measures, including range of HRV (rangeHR, in msec), exhalation over inhalation ratio (E/I ratio, unitless) and standard deviation of the beat-to-beat heart rate (sdNN, in msec), for each subgroup and agent

Change	Δrange HR (bpm)	ΔE/I ratio (unitless)	ΔsdNN (msec)
Significance of changes are marked (*p<0.010 or **<0.001). See Table I for more details. See text for discussion.
(+)Carvedilol	1.92**	0.04**	12.66**
(+)Metoprolol	−2.55**	−0.01	1.54*
(−)Carvedilol	−0.20**	0.07**	0.76**
(−)Metoprolol	−3.49**	−0.01	−0.60**
(o)Carvedilol	−0.35	0.02	12.25*
(o)Metoprolol	−0.75	0.01	−4.50