|Study group||AOSSM criteria ||Activity tracker criteria||Duration|
|Group 1: Sport specialist, MVPA||1. Participation in intensive training and/or competition in organized sports greater than 8 months per year (essentially year round) |
2. Participation in 1 sport to the exclusion of participation in other sports (limited free play overall) 
3. Involving prepubertal (seventh grade or roughly age 12 years) children.
|Greater than 180 accumulated minutes of MVPA [31, 32] during participation in one sport type across one week of activity tracking||Meets criteria within either one or both years of follow-up|
|Group 2: Non-sport specialist, any activity level||1. Participation in more than 1 sport at any physical activity level|
2. Participation in none or low training and/or competition in organized sports for any period of time.
3. Involving prepubertal children.
|Greater than or less than 180 accumulated minutes of MVPA across one week of activity tracking||Meets criteria during both years of follow-up|