Table 3.

Example data elements and granularities participants from [74] described tracking for each data type. Data elements were generally orthogonal to a participant’s goal, depending more on their habits and experiences.

Data Type	Example Data Element	Example Granularity
Symptoms	Migraine	Binary
		Duration
		Location
		Severity from 1–10
		MIDAS score (i.e., a validated scale to characterize severity [81])
	Aura	Binary
	Nausea	Binary
Treatments	Medications	Binary (i.e., for specific medications)
		Number of pills
	Supplements	Binary (i.e., for specific supplements)
	Yoga	Binary
	Mindfulness	Unspecified
	Exercise	Number of steps
		Fitbit reports
		Minutes
Contributors	Caffeine	Binary
		Number of milligrams
	Menstruation	Using a menstrual tracking app
	Diet	Everything they ate
		Whether they ate a specific thing (e.g., corn, dairy, wheat, tannins, nitrates)
	Sleep quality	Using a Fitbit
		Scale from 1–10