title: Actigraph placement and sleep estimation in children.
abstract: OBJECTIVE
  To determine whether actigraph placement affects sleep estimation in children.
  
  
  METHODS
  Descriptive study.
  
  
  METHODS
  Naturalistic setting.
  
  
  METHODS
  Twenty children aged 7-12 years from primary schools.
  
  
  METHODS
  N/A.
  
  
  METHODS
  Motor activity was measured from the waist and non-dominant wrist with actigraphs for three consecutive days during a school week.
  
  
  RESULTS
  The minute-by-minute agreement of sleep-wake states between the two measurement sites was 92.5%. Wrist- and waist-recorded sleep parameters correlated well and the mean values did not differ.
  
  
  CONCLUSIONS
  Although the placement of the actigraph slightly affected the measured activity parameters, its influence on 3-night mean sleep estimates in children was not statistically significant.
authors.affiliation: Department of Child Psychiatry, University of Helsinki, Finland.
authors.forename: E Juulia
authors.initials: EJ
authors.lastname: Paavonen
authors.forename: Mika
authors.initials: M
authors.lastname: Fjällberg
authors.forename: Maija-Riikka
authors.initials: MR
authors.lastname: Steenari
authors.forename: Eeva T
authors.initials: ET
authors.lastname: Aronen
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D017286:Polysomnography / Q000295:instrumentation*; D012893:Sleep Wake Disorders / Q000175:diagnosis* / Q000453:epidemiology