Table 1.

Selection criteria of self-quantification (SQ) tools. Table rows do not imply direct correspondences among health SQ tools but rather indicate the presence of a feature in the selected SQ tool or service.

Feature related to data collection	Tool number
	1	2	3	4	5	6	7	8
Manual data collection			X	X
Automatic data collection	X	X			X	X
Single-use data collection							X	X
Data types	Sleep hours and quality	Body movement–related data, for example, steps taken	Blood pressure and pulse	Mood	Blood glucose	Environmental data, for example, ambient humidity	Genome data (single nucleotide polymorphism profile)	Microbiome data