Table 1.

Demographics for the participants.

Characteristics		Male (n=42)	Female (n=80)	Unspecified (n=1)	Total (n=123)
Age, mean (SD)		24.8 (3.2)	23.9 (3.4)	23 (—a)	24.2 (3.4)
Years of study, mean (SD)		4.1 (0.4)	4.1 (0.4)	4 (—)	4.1 (0.4)
Mobile operating system (corresponding number of participants, n)
	iOS (tablet, smartphone, or iPod)	24	47	1	72
	Android (tablet or smartphone)	21	36	0	57
	Other (tablet or smartphone)	2	2	0	4
	Several different OS (accumulated)	4	5	0	9
Use of apps in general (corresponding number of participants, n)
	No	4	2	1	7
	Yes	38	78	0	117
Ratings submitted (total, N=343)		115	225	3	343
Ratings provided (per participant, mean [SD])		2.7 (0.6)	2.8 (0.4)	3 (—)	2.8 (0.5)
Apps assigned (n)		90	132	3	143

^aNot applicable.