Table 1.

Characteristics of participants in the Center for Behavioral Intervention Technologies recruitment registry and enrolled in at least one clinical trial. Percentages were calculated using nonmissing observations.

Variable		Registry participants (N=5337), n (%)	Enrolled participants (n=770), n (%)
Gender		N=5333	N=770
	Female	4062 (76.2)	584 (75.8)
	Male	1217 (22.8)	183 (23.8)
	Other	54 (1)	3 (0.4)
Mobile device		N=5334	N=769
	Yes	5141 (96.4)	741 (96.4)
	No	193 (3.6)	28 (3.6)
Mobile device type		N=5136	N=695
	Android	3512 (68.4)	556 (80)
	iPhone	1569 (30.5)	138 (19.9)
	Windows	27 (0.5)	0 (0)
	Other	28 (0.5)	1 (0.1)
Access to internet		N=5141	N=770
	Yes	5090 (99.0)	770 (100)
	No	51 (1.0)	0 (0)