1. Sport Participation and Physical Activity in Adolescent Females across a Four-Year Period 
Karin Allor Pfeiffer, Ph.D., Marsha Dowda, Dr.P.H., Rod K. Dishman, Ph.D., Kerry L. McIver, M.A., John R. Sirard, Ph.D., Dianne S. Ward, Ed.D., Russell R. Pate, Ph.D. 
Journal of Adolescent Health 
Volume 39, Issue 4, Pages (October 2006)
DOI: /j.jadohealth
Copyright © 2006 Society for Adolescent Medicine Terms and Conditions

2. Figure 1
Vigorous physical activity (VPA) across four years; 9th grade dropout refers to participants who played sports in 8th grade; 12th grade droupouts refers to participants who played sports in 8th and 9th grade.
Journal of Adolescent Health  , DOI: ( /j.jadohealth )
Copyright © 2006 Society for Adolescent Medicine Terms and Conditions