title: Validity and prognostic value of parental ratings of children's activity.
abstract: OBJECTIVE
  To determine whether parental reports of children's physical activity are stable over time and correlate with objectively-measured physical activity.
  
  
  METHODS
  Participants were 322 twin children from a large UK twin cohort. When the children were aged 4 (1999) and 11 (2006), mothers rated their activity levels using four different measures. These included children's enjoyment of active pastimes, their habitual activity level, their activity compared with others of the same age and sex and a standard scale for 'fidgetiness'. Children wore an Actigraph (model 7164) for 7 consecutive days at the 11 year follow up from which total physical activity was calculated.
  
  
  RESULTS
  From age 4 to 11 amount and enjoyment of physical activity declined, but significant temporal correlations over the 7 year interval (range r=0.19 to 0.52) suggested that relative activity level was maintained. Habitual physical activity level, enjoyment of activity and fidgetiness at age 11 were all significantly associated with activity counts (all p values<0.05).
  
  
  CONCLUSIONS
  These results indicate that parental ratings can be valid indicators of children's physical activity, and that children who are perceived to be more active at 4 years are still more active at 11 years.
authors.affiliation: University College London, London, UK.
authors.forename: Lisa R
authors.initials: LR
authors.lastname: Purslow
authors.forename: Cornelia H M
authors.initials: CH
authors.lastname: van Jaarsveld
authors.forename: Claudia
authors.initials: C
authors.lastname: Semmler
authors.forename: Jane
authors.initials: J
authors.lastname: Wardle
mesh_terms: D015992:Body Mass Index; D002648:Child; D002652:Child Behavior; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009034:Mother-Child Relations; D009035:Mothers; D009043:Motor Activity; D019370:Observation; D015588:Observer Variation; D012044:Regression Analysis; D015203:Reproducibility of Results