title: Nine year changes in sitting time in young and mid-aged Australian women: findings from the Australian Longitudinal Study for Women's Health.
abstract: OBJECTIVE
  To examine changes in sitting time (ST) in women over nine years and to identify associations between life events and these changes.
  
  
  METHODS
  Young (born 1973-78, n=5215) and mid-aged (born 1946-51, n=6973) women reported life events and ST in four surveys of the Australian Longitudinal Study on Women's Health between 2000 and 2010. Associations between life events and changes in ST between surveys (decreasers ≥2 h/day less, increasers ≥2 h/day more) were estimated using generalized estimating equations.
  
  
  RESULTS
  Against a background of complex changes there was an overall decrease in ST in young women (median change -0.48 h/day, interquartile range [IQR]=-2.54, 1.50) and an increase in ST in mid-aged women (median change 0.43 h/day; IQR=-1.29, 2.0) over nine years. In young women, returning to study and job loss were associated with increased ST, while having a baby, beginning work and decreased income were associated with decreased ST. In mid-aged women, changes at work were associated with increased ST, while retiring and decreased income were associated with decreased ST.
  
  
  CONCLUSIONS
  ST changed over nine years in young and mid-aged Australian women. The life events they experienced, particularly events related to work and family, were associated with these changes.
authors.affiliation: The University of Queensland, Centre for Research on Exercise Physical Activity and Health, School of Human Movement Studies, Brisbane, Australia. Electronic address: b.clark3@uq.edu.au.
authors.forename: B K
authors.initials: BK
authors.lastname: Clark
authors.affiliation: The University of Queensland, Centre for Research on Exercise Physical Activity and Health, School of Human Movement Studies, Brisbane, Australia; The University of Queensland, School of Population Health, Brisbane, Australia.
authors.forename: G M E E
authors.initials: GM
authors.lastname: Peeters
authors.affiliation: The University of Queensland, Centre for Research on Exercise Physical Activity and Health, School of Human Movement Studies, Brisbane, Australia.
authors.forename: S R
authors.initials: SR
authors.lastname: Gomersall
authors.affiliation: The University of Queensland, Centre for Research on Exercise Physical Activity and Health, School of Human Movement Studies, Brisbane, Australia.
authors.forename: T G
authors.initials: TG
authors.lastname: Pavey
authors.affiliation: The University of Queensland, Centre for Research on Exercise Physical Activity and Health, School of Human Movement Studies, Brisbane, Australia.
authors.forename: W J
authors.initials: WJ
authors.lastname: Brown
mesh_terms: D000328:Adult; D017677:Age Distribution; D000704:Analysis of Variance; D001315:Australia; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D008016:Life Change Events; D008137:Longitudinal Studies; D008875:Middle Aged; D009043:Motor Activity; D057185:Sedentary Behavior; D013997:Time Factors; D016387:Women's Health / Q000639:trends*; D055815:Young Adult
keywords: Life events; Longitudinal study; Sitting; Women