Table 2.

Winners’ versus nonwinners’ baseline characteristics and engagement.^a

	Winners (n=17,171)	Nonwinners (n=8678)	Winners versus nonwinners (P value)
Male, n (%)	3489 (20.32)	803 (9.25)	<.001
Baseline weight kg, mean (SD)	87.1 (22.1)	88.1 (22.4)	<.001
Amount bet US $, mean (SD)	$29.79 ($29.18)	$23.83 ($12.30)	<.001
Shared on Facebook,b n (%)	4837 (53.19)	2241 (46.79)	<.001
Weigh-ins, mean (SD)	7.0 (4.2)	5.4 (3.1)	<.001
Social engagement, c mean (SD)	13.6 (113.6)	8.8 (38.4)	<.001

^aGiven that completion was associated with baseline characteristics and engagement, to control for potential confounding of completion, only game completers were included in these analyses, n=25,849.

^bOption to share on Facebook was not available in early games. Thus, the sample size for this variable is smaller than the overall sample of completers. Specifically, of those who were given the option to share on Facebook, n=20,059, a total of n=13,882 completed the game. Of those, n=9093 were winners and n=4789 were nonwinners.

^cSum of cheers, comments, replies, likes, photos, and updates.