Table 2.

Examples of anticipated activity and mobility features to extract and analyze from Wi-Fi sensing data.

Category and activity type		Definition
Daily activities
	Fridge time	The first moment the person touches the door to open it and actively performs fridge activity (eg, shuffling items around in the freezer)
	Sink use	The start and end time of standing at the sink or faucet use time
	Sitting in the dining area	The start and end time the body touches the dining chair and gets off the chair
	Cooking	The start time and end time of stove use or microwave use
	Phone use	The time the person starts using a phone or tablet (eg, text, app use, and phone call) and the time the person stops
Mobility behaviors
	Entering apartment	The time the person opens the front door and to the end time the person closes the door to get into the apartment
	Exiting apartment	The time the person opens the front door and the time the person closes the door to exit
	Entering a private area (eg, bedroom or bathroom)	The time the person passes a bedroom or bathroom door or threshold to enter a private area
	Exiting a private area	The time the person passes a bedroom or bathroom door or threshold to exit from a private area
	Sitting on sofa	The start and end time the body touches the sofa and gets off the sofa (sitting position, does not include the lying position)
	Lying on sofa	The start time as the time the participant lies horizontally and end time as the time the participant returns to a sitting position
Other
	Second person	The time the person appears and disappears from space