Table 4.

Area under the receiver operating curve (AUC) and optimal threshold for the change in daily average heart rate expressed as cycle length (ΔCL), the difference in HRV5 (ΔHRV5), and the difference in daily step count (Δsteps) for the prediction of an absolute LVEF improvement of ≥10%; AUC = area under the curve; HRV5 = heart rate variability approximate; CL = cycle length.

Parameter	AUC	Optimal Cut-Off
ΔHRV5	0.678	23 ms
ΔCL	0.566	112 ms
Δsteps	0.625	1163 steps