TABLE 5. Apple Watch Data Characteristics.

Measures	People	Days	Panic Days	Mean (SD)
HRV	32	273	48	41.41 (18.54)
RHR	32	241	40	66.09 (7.50)
Activty Distance Flights Steps	32	264	44	2.77 (1.69) 4.36 (3.22) 5934 (3621)
RR	18	135	32	16.48 (1.72)
Noise	10	125	23	62.51 (5.43)

Note: HRV = Heart Rate Variability in milliseconds, RHR = Resting Heart Rate in beats per minute, Flights = Stair flights climbed, Distance = miles walked, RR = Respiratory Rate in breaths per minute, Noise = Ambient Noise Level in decibels, People = Number of participants with the associated measure, Days = Number of days with measure available, Panic Days = Number of days with the measure available where panic attack occurred, SD = standard deviation. Means winzorized at 95%.