title: Assessing volume of accelerometry data for reliability in preschool children.
abstract: OBJECTIVE
  This study examines what volume of accelerometry data (h·d) is required to reliably estimate preschool children's physical activity and whether it is necessary to include weekday and weekend data.
  
  
  METHODS
  Accelerometry data from 493 to 799 (depending on wear time) preschool children from the Melbourne-based Healthy Active Preschool Years study were used. The percentage of wear time each child spent in total (light-vigorous) physical activity was the main outcome. Hourly increments of daily data were analyzed. t-tests, controlling for age and clustering by center of recruitment, assessed the differences between weekday and weekend physical activity. Intraclass correlation coefficients estimated reliability for an individual day. Spearman-Brown prophecy formula estimated the number of days required to reach reliability estimates of 0.7, 0.8, and 0.9.
  
  
  RESULTS
  The children spent a significantly greater percentage of time being physically active on weekend compared with weekdays regardless of the minimum number of hours included (t = 12.49-16.76, P < 0.001 for all). The number of days required to reach each of the predetermined reliability estimates increased as the number of hours of data per day decreased. For instance, 2.7-2.8 d of data were required to reach a reliability estimate of 0.7 with 10 or more hours of data per day; 3.3-3.4 d were required to meet the same reliability estimate for days with 7 h of data.
  
  
  CONCLUSIONS
  Future studies should ensure they include the minimum amount of data (hours per day and number of days) as identified in this study to meet at least a 0.7 reliability level and should report the level of reliability for their study. In addition to weekdays, at least one weekend day should be included in analyses to reliably estimate physical activity levels for preschool children.
authors: Interdisciplinary Educational Research Institute, University of Wollongong, Wollongong, New South Wales, Australia. trina.hinkley@deakin.edu.au
authors: Trina
authors: T
authors: Hinkley
authors: Eoin
authors: E
authors: O'Connell
authors: Anthony D
authors: AD
authors: Okely
authors: David
authors: D
authors: Crawford
authors: Kylie
authors: K
authors: Hesketh
authors: Jo
authors: J
authors: Salmon
mesh_terms: D056044:Actigraphy; D002675:Child, Preschool; D015331:Cohort Studies; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D015203:Reproducibility of Results; D013223:Statistics as Topic; D014739:Victoria