title: Correlates of physical activity in 2-year-old toddlers: the generation R study.
abstract: OBJECTIVE
  To describe and identify correlates of objectively measured physical activity and sedentary behavior in 2-year-old toddlers.
  
  
  METHODS
  A total of 347 children participating in a birth cohort study wore a unaxial ActiGraph accelerometer during 1 weekday and 1 weekend day. Information on potential correlates was assessed by parent-reported questionnaires, delivery reports, and regular visits to child health centers. Univariate and multivariable linear regression analyses were conducted to examine the associations between potential correlates and the following physical activity outcomes: percentage of time spent in sedentary behavior, percentage of time spent in moderate-to-vigorous physical activity, and mean counts per minute.
  
  
  RESULTS
  A high percentage of monitored time was spent in sedentary behavior; 85.6% on weekdays and 84.5% on weekend days. Four correlates were significantly associated with at least 1 physical activity outcome in the multivariable regression models: child's sex, child's age, number of siblings, and season of measurement. The associations of gross motor development with moderate-to-vigorous physical activity and mean counts per minute approached significance. Associations of socioeconomic variables and child's body mass index z-score with physical activity outcomes were not significant.
  
  
  CONCLUSIONS
  Two-year-old toddlers spend most of their time in sedentary behavior. No modifiable correlates were identified. Further research on physical activity and associated health benefits among very young children is warranted.
authors.affiliation: The Generation R Study Group, Erasmus Medical Center, Rotterdam, The Netherlands. a.wijtzes@erasmusmc.nl
authors.forename: Anne I
authors.initials: AI
authors.lastname: Wijtzes
authors.forename: Marjolein N
authors.initials: MN
authors.lastname: Kooijman
authors.forename: Jessica C
authors.initials: JC
authors.lastname: Kiefte-de Jong
authors.forename: Sanne I
authors.initials: SI
authors.lastname: de Vries
authors.forename: Jens
authors.initials: J
authors.lastname: Henrichs
authors.forename: Wilma
authors.initials: W
authors.lastname: Jansen
authors.forename: Vincent W V
authors.initials: VW
authors.lastname: Jaddoe
authors.forename: Albert
authors.initials: A
authors.lastname: Hofman
authors.forename: Henriette A
authors.initials: HA
authors.lastname: Moll
authors.forename: Hein
authors.initials: H
authors.lastname: Raat
mesh_terms: D061725:Accelerometry; D002652:Child Behavior; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D009043:Motor Activity; D015999:Multivariate Analysis; D009426:Netherlands; D011446:Prospective Studies; D012621:Seasons; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires
keywords: BMI; Body mass index; CPM; Counts per minute; MVPA; Moderate-to-vigorous physical activity; NASPE; National Association for Sport and Physical Education; TV; Television