Table 4.

Empatica E4 Signal Description.

Filename	Columns	Measure	Description	Unit
ACC.csv	Column I	Accelerometer x-axis	Acceleration of the device along the x-axis	m/s2
	Column II	Accelerometer y-axis	Acceleration of the device along the y-axis	m/s2
	Column III	Accelerometer z-axis	Acceleration of the device along the z-axis	m/s2
BVP.csv	Column I	BVP	The volume of blood that passes through the tissues in the wrist and is used to measure IBI and Heart Rate	N/A
HR.csv	Column I	Heart Rate	A derived metric that measures the number of beats per minute based on Blood Volume Pulse	bpm
EDA.csv	Column I	EDA	Measurement of the skin conductivity levels	μS
IBI.csv	Column I	Time	Time interval	Second
	Column II	IBI	Beat-to-beat interval	Second
TEMP.csv	Column I	Skin Temperature	The external temperature of the skin	Celsius