Table 2.

Summary of the unique top 5 most important features across analyses.

Predictors		Analysis at each point in time
Feature	Description	Core 0	Core 1	Core 2	Core 3	Core 4	Core 5
Core 0 completion date—intervention start datea	Time to complete core 0 in days	+b	+	N/Ac	N/A	N/A	N/A
Arise time—awake timea	Difference between time of awakening and getting out of bed in minutes (time to get up)	+	N/A	N/A	N/A	N/A	N/A
Usual arise time	Retrospective report specified from baseline data	+	N/A	N/A	N/A	N/A	N/A
Wake after sleep onset	Minutes awake in the middle of the night from sleep diaries	+	+	N/A	N/A	N/A	N/A
Sleep onset latency	Minutes to fall asleep from sleep diaries	+	N/A	N/A	N/A	N/A	N/A
Baseline arise time (pre retro sleep arising time)	Time the user specified that they got out of bed from baseline data	N/A	+	+	N/A	N/A	N/A
Pre retro sleep waking early	User indicates having problems waking up too early in the morning	N/A	+	N/A	N/A	N/A	N/A
Pre teach trust info source c	How much the user trusts health information	N/A	+	N/A	N/A	N/A	N/A
Average time to complete corea	Average time to complete a core among all cores that have been available up to the point of the analysis	N/A	N/A	+	+	+	+
Pre stpi 24 depd,e	How low the user feels at baseline	N/A	N/A	+	N/A	N/A	N/A
Pre se gen 3f	How well the user feels things have been going	N/A	N/A	+	N/A	N/A	N/A
Bedtime	If a participant went to bed in the AM or PM (before or after 12 AM)	N/A	N/A	+	N/A	N/A	N/A
Email senta	If the system sent an email that day	N/A	N/A	N/A	+	N/A	N/A
Pre stpi 26 curg	How stimulated the user feels at baseline	N/A	N/A	N/A	+	+	N/A
Trigger event loggeda	If the system logged a trigger event that day	N/A	N/A	N/A	+	N/A	N/A
Pre teach stress 6	User feels he or she can solve most problems if necessary effort is put in	N/A	N/A	N/A	+	N/A	N/A
Pre stpi 18 curh	How eager the user feels at baseline	N/A	N/A	N/A	N/A	+	N/A
Core 4 completion date—core 4 start datea	Time to complete core 4 in days	N/A	N/A	N/A	N/A	+	+
Pre stpi 29 anxi	How much self-confidence the user feels at baseline	N/A	N/A	N/A	N/A	+	N/A
Days since the last informationa	Days since the last contact (any interaction)	N/A	N/A	N/A	N/A	N/A	+
Pre CESDj 14k	How lonely the user feels at baseline	N/A	N/A	N/A	N/A	N/A	+
Pre retro sleep length of sleep prob	Number of months the user reports having had sleep difficulties at baseline.	N/A	N/A	N/A	N/A	N/A	+

^aHandcrafted/theory-driven features.

^b+ indicates appearance of feature in corresponding core analysis.

^cN/A: not applicable.

^dSTPI: state-trait personality inventory.

^ePre stpi 24 dep: baseline STPI measure item #24 depression subscale.

^fPre se gen 3: baseline Perceived Stress Scale item #5.

^gPre stpi 26 cur: baseline STPI measure item #26 curiosity subscale.

^hPre stpi 18 cur: baseline STPI measure item #18 curiosity subscale.

ⁱPre stpi 29 anx: baseline STPI measure item #29 anxiety subscale.

^jCenter for Epidemiologic Studies Depression Scale.

^kPre CESD 14: baseline CESD measure item #14.