Table 1.

Features extracted from the passively collected MAIKI data.

Feature type	Name	Description
GPS	Location variance	The logarithm of the sum of the statistical variances in the latitude and the longitude of all GPS coordinates in the day
	Location entropy	The variability of the time that participants spend in significant places in the day
	Normalised location entropy	The location entropy divided by the logarithm of the number of significant places
	Time at home	Home is defined as the most frequent significant place where a participant spent the most time between 0 to 6 am; time at home is defined as the percentage of time a participant spent at home relative to other significant places
	Total distance	The total distance covered by a participant during the day
Communication	Total calling frequency	The number of times that a participant answers and makes phone calls during a day
	Total calling duration	The total time in minutes that a participant spends each day answering and making phone calls (in min)
	Non-working time calling frequency	The number of times that a participant answers and makes phone calls at times other than 8 to 6 pm during a day
	Non-working time calling duration	The total time that a participant answers and makes phone calls at times other than 8 to 6 pm during the day (in min)
	Number of missed calls	The number of calls that are marked as missed during the day
	Number of contacts	The number of contacts a participant answers and makes phone calls during the day
	Calling entropy	The variability of calling durations a participant spends in contacts during the day
	Normalised calling entropy	Calling entropy divided by the logarithm of the number of contacts during the day
Phone usage	Phone usage frequency	The number of times that a participant interacts with their phone during a day
	Phone usage duration	The total time in minutes that participants spend each day interacting with their mobile phones
User activity	Lock screen duration	The total time in minutes that participants lock their mobile phones during the day
	Number of used apps	The number of applications that a participant uses during the day
	Midnight app usage	The number of applications that a participant uses between 0 to 5 am during the day
	Sleep time	Sleep time [min] is considered to be between the last time an app was used in the previous day (or in the same day before 2 am if available) and the first time an app was used after 5 am

Four types of features have been derived: GPS, communication, phone usage as well as user activity features.