*2.1. Participants*

The study was conducted in the United States in 2016. Two groups of young workers were recruited for the study: young workers employed at a city park and recreation program (Park and Rec) in the Pacific Northwest and young workers who were members of Amazon Marketplace Mechanical Turk (MTurk) who were located throughout the US. In order to be eligible for the study, the participants in both groups had to be less than 25 years of age and living in the United States. At baseline, 57 Parks and Rec workers agreed to participate after receiving a letter with details on the study during orientation. A second group of young workers were recruited online via Amazon Marketplace Mechanical Turk (MTurk): an open online marketplace for work that requires human intelligence [21]. Around 1000 MTurk workers answered a series of five questions as part of an eligibility screener. One hundred sixty-seven young workers between 18 and 24 years of age who met the eligibility criteria were recruited at baseline.

Park and Rec participants received \$25 for completing the initial survey and training, and another \$25 for completing the follow-up survey in the form of an Amazon gift card sent via email. MTurk workers received \$0.02 to complete the initial screener, \$20.00 to complete the training, and \$4.00 to complete the follow-up survey through the MTurk platform. MTurk participants were paid less based on the time and difficulty of the task and because of the culture of the platform, where requestors (i.e., researchers) were discouraged from inflating payments to promote responses. The Oregon Health & Science University institutional review board approved the study materials and procedures.
