Table 1.

Descriptive Statistics

Variable	Description	Mean	Std. Dev.	Min	Max
Steps	Number of steps walked daily	10,628	4,273	0	37,835
Leaderboard	An indicator if an individual has adopted a leaderboard	0.47	0.50	0	1
Age	Age at the start of the study	17.94	0.65	17	26
Body Mass Index	Body mass index at the start of the study	22.97	3.30	16.07	38.01
Female	An indicator for whether the individual is a female	0.51	0.50	0	1
Leaderboard Size	The number of users on the leaderboard (excluding the focal users)	4.78	4.46	1	25
Leaderboard Size (Active)	The number of users on the leaderboard that have a non-zero step count (excluding the focal users)	2.31	2.64	0	17