Table 3.

Correlation analysis: Changes in heart failure parameters between the first and last seven days of usage, and, for left ventricular ejection fraction, between prescription and end of WCD wear time, respectively; WCD = wearable cardioverter–defibrillator; LVEF = left ventricular ejection fraction; HRV5 = heart rate variability approximate.

Correlation Analysis for Heart Failure Parameters	Correlation Coefficient (r)	p-Value
∆Heart rate/∆HRV5	0.382	<0.001
∆Heart rate/∆Step count per day	0.068	0.297
∆Step count per day/∆HRV5	0.320	<0.001
Age/∆Step count per day	−0.256	<0.001
Age/∆HRV5	−0.143	0.029
Age/∆Heart rate	0.048	0.465
Age/∆LVEF	−0.251	<0.001
∆LVEF/∆HRV5	0.255	<0.001
∆LVEF/∆Step count per day	0.189	0.005
∆LVEF/∆Heart rate	0.028	0.684