Table 6.

Summary of features used in previous work.

Features	Description
Physical activity	Durations of walking states, stationary state, and stationary plus in vehicle state
Speech and conversational interaction	The number of independent conversations and their duration as a proxy for social interaction. The ratio of detected human voice labels observed (e.g., amongst all inferred audio frames during a day, for example, 10% human voice)
Location and mobility	Distance traveled, the number of places visited, and location entropy from the location data, the number of places visited, the distance traveled, and location entropy using the centroid coordinates of visited places
Sleep	Sleep duration, sleep onset time, and wake time each 24 h period day based on the longest period of inferred sleep from ambient light, audio amplitude, activity, and screen on/off
Phone usage, calls, and texting	The number of phone lock/unlock events and the duration that the phone is unlocked. the number and duration of incoming and outgoing phone calls, and the number of incoming and outgoing SMS messaging
Ambient environment	Mean audio amplitude to determine the acoustic conditions ranging from quiet to loud environments. The standard deviation of the audio amplitude