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. 2021 Mar 11;23(3):e18348. doi: 10.2196/18348

Table 1.

Mean, SD, and between-group statistics on demographic information and usage behavior through 49 days (N=8622).

Variable	RCT^a sample (n=231), mean (SD)	Community sample (n=8391), mean (SD)	F test	P values	d
Age (years)	38.79 (10.73)	41.78 (13.64)	9.07	.003	0.20
Female (%)	1.70 (0.46)	1.66 (0.47)	1.07^b	.30	N/A
49-day logins (n)	11.26 (15.78)	3.90 (6.91)	229.21	<.001	1.01
49-day trackings (n)	11.26 (10.42)	2.57 (5.95)	343.48	<.001	1.24
49-day mod^c started (n)	1.14 (1.62)	0.53 (0.85)	113.81	<.001	0.71
49-day mod completed (n)	1.02 (1.53)	0.12 (0.53)	555.85	<.001	1.57

^aRCT: randomized controlled trial.

^bChi-square statistic.

^cmod: modules.