title: The relationship between school physical activity policy and objectively measured physical activity of elementary school students: a multilevel model analysis.
abstract: BACKGROUND
  There is evidence of school level variability in the physical activity of children and youth. Less is known about factors that may contribute to this variation. The purpose of this study was to examine if the school health environment (Healthy Physical Environment, Instruction and Programs, Supportive Social Environment, and Community Partnerships) is associated with objectively measured time spent in light to vigorous physical activity among a sample of Toronto children.
  
  
  METHODS
  The sample comprised 856 grade 5 and 6 students from 18 elementary schools in Toronto, Ontario. Multilevel linear regression analyses were used to examine the impact of school physical activity policy on students' time spent in light-to-vigorous physical activity.
  
  
  RESULTS
  Significant between-school random variation in objectively measured time spent in light-to-vigorous physical activity was identified [σ(2)μ0 = 0.067; p < 0.001]; school-level differences accounted for 6.7% of the variability in the time individual students spent in light-to-vigorous physical activity. Of the 22 school-level variables, students attending schools with support for active transportation to/from school and written policies/practices for physical activity, accumulated significantly more minutes of physical activity per school week than students who attended schools that did not.
  
  
  CONCLUSIONS
  School physical activity policy and support for active school travel is associated with objectively measured time spent in light to vigorous physical activity. School physical activity policy might be a critical mechanism through which schools can impact the physical activity levels of their students.
authors.affiliation: Faculty of Kinesiology and Physical Education, University of Toronto, 55 Harbord Street, Toronto, ON M5S 2W6, Canada.
authors.forename: Guy
authors.initials: G
authors.lastname: Faulkner
authors.affiliation: Faculty of Kinesiology and Physical Education, University of Toronto, 55 Harbord Street, Toronto, ON M5S 2W6, Canada.
authors.forename: Laura
authors.initials: L
authors.lastname: Zeglen
authors.affiliation: School of Public Health and Health Systems, University of Waterloo, 200 University Ave West, Waterloo, ON N2L 3G1, Canada.
authors.forename: Scott
authors.initials: S
authors.lastname: Leatherdale
authors.affiliation: School of Public Health and Health Systems, University of Waterloo, 200 University Ave West, Waterloo, ON N2L 3G1, Canada.
authors.forename: Steve
authors.initials: S
authors.lastname: Manske
authors.affiliation: School of Health and Human Performance, Faculty of Health Professions, Dalhousie University, 6230 South Street, PO Box 15000, Halifax, NS B3H4R2, Canada.
authors.forename: Michelle
authors.initials: M
authors.lastname: Stone